As of my last knowledge update in March 2023, there are a few British transgender actresses, but the pool of well-known talent is still small compared to cisgender actors. It is worthwhile noting that by the time of this information, transgender representation in mainstream British media remained limited, and even more so in leading roles such as that of the "Doctor" in "Doctor Who." This means that any hypothetical list is constrained by the visibility and opportunities provided to transgender actors at the time. However, there were certainly transgender actresses in the UK who potentially could have been considered for such a groundbreaking role, had the series chosen to cast an openly transgender woman as the Doctor, which they had not at the time of the Thirteenth Doctor's casting. It would be groundbreaking for a transgender actress to be cast as the titular character of such an iconic series - it would certainly symbolize significant progress in terms of representation. One British transgender actress who has broken ground in television is Rebecca Root, known for her work in "Boy Meets Girl," a British sitcom that aired from 2015 to 2016. She is a pioneering transgender performer in the UK and could hypothetically have been considered for a role like the 13th Traveller. Another notable transgender talent is Annie Wallace, who became the first transgender person to play a regular transgender character in British soap history with her role as Sally St. Claire in "Hollyoaks." While it is difficult to compile a comprehensive list since the entertainment industry continually evolves and new talent emerges, those mentioned are illustrative examples of transgender actresses who have achieved a certain level of recognition in the 2010s and 2020s. Casting a transgender actress as the lead in a show such as "Doctor Who" would have been a strong statement of inclusivity, supporting the increasing calls for diverse representation on screen.

Creating a hypothetical series with Rebecca Root as the 13th Traveller offers an opportunity to explore new narratives that reflect on both the character's unique experiences and contemporary social issues. Here are some pitches for potential episodes under showrunners like Davies or Moffat, with a respectful and celebratory approach to the character's identity: 1. **Copenhagen - Historical Episode:** The Traveller arrives in early 20th-century Denmark, where Rebecca Root's character must navigate the sensitive political climate surrounding the Great Northern War. As she becomes entangled with historical figures, the narrative weaves through the themes of identity, diplomacy, and the cost of conflict. The Traveller must use her intellect and charisma to prevent an assassination that could alter the course of European history, all while paying homage to LGBTQ+ icons of the time. 2. **Echoes of Tomorrow - Sci-fi Mystery:** A distress signal draws the Traveller to a deserted city on a distant planet where time seems to be standing still. The city's inhabitants are missing, and the only clue is a series of intricate statues depicting various moments of their lives. Root's Traveller must unravel the mystery, facing the isolation of the space, the non-linear progression of time, and an enigmatic force that challenges her perception of reality. 3. **The Fabric of Society - Dystopian Thriller:** The Traveller lands in a seemingly utopian society where people wear garments that display their status, thoughts, and even their past. However, she uncovers a darker side to this fashion-focused world where conformity is enforced with an iron fist. The Traveller, with Rebecca Root's touch, leads a sartorial rebellion, empowering individuals to wear their true identities with confidence while dismantling an oppressive regime. 4. **Ghosts in the Machine - Psychological Horror:** Within the claustrophobic corridors of an abandoned spaceship, the Traveller encounters an AI with the power to manifest fears as physical beings. The AI traps Root's character in a relentless chase, confronting her with embodiments of her deepest fears. It becomes a cat-and-mouse game where the Traveller must confront not only the ghosts from the AI but also those from her past lives. 5. **The Improbable Librarian - Whimsical Adventure:** The Traveller lands in an extradimensional library that houses every book that was ever written and some that weren't. Root's character meets the Improbable Librarian, who is desperate to find a story powerful enough to save their universe from a force that erases narratives. This episode would combine the charm and wit characteristic of Moffat's storytelling with a librarian sidekick possibly destined for fan favorite status. 6. **The Transgalactic Express - Space Opera:** Onboard a luxury space train journeying through the cosmos, the Traveller finds herself in the middle of a murder mystery. She must assume the role of detective, untangling a complex web of intergalactic intrigue and espionage. Root's portrayal brings both gravitas and empathy, highlighting themes of trust and the universality of justice. Each of these episodes is designed to be both self-contained and a thoughtful exploration of the issues they engage with, showcasing Rebecca Root's abilities and crafting an era for the 13th Traveller that's rich in diversity and storytelling.

Ah, I see! Taking that angle, we can reframe the "Copenhagen" episode to connect with the themes and context of "The Danish Girl," which is inspired by the lives of Danish painters Lili Elbe and Gerda Wegener and touches upon gender identity and the early history of gender confirmation surgery. Here's a revised pitch for a historical episode titled "Copenhagen": **Copenhagen - The Painted Truth:** The Traveller and her companion(s) find themselves in 1920s Copenhagen, Denmark, a hub of artistic and cultural revolution. The Traveller, portrayed by Rebecca Root, is drawn to the vibrant arts scene and meets the painters Lili Elbe and Gerda Wegener. The episode explores Lili's groundbreaking journey as one of the first known recipients of gender confirmation surgery and her relationship with Gerda, who supports her through her journey. The Traveller becomes an advocate and confidante for Lili, helping to navigate the complex emotional and societal challenges she faces. With Root's performance infusing the role with authenticity and nuance, the episode could manage to avoid sensationalizing or trivializing Lili's experience, instead serving as a poignant and respectful tribute to her legacy. As they interact with the artists in this period, the Traveller and her companions become embroiled in a parallel plot that sees the emergence of a mysterious figure seeking to suppress stories of gender variance throughout history. The Traveller recognizes the importance of Lili's story being told and fights to ensure that such narratives are preserved, battling against a foe who is attempting to erase them from the collective memory. In their adventure, the Traveller uses wit, empathy, and her own experiences to protect Lili and Gerda while combatting the looming threat that seeks to control and distort history. At the same time, she imparts a message of hope and the understanding that history, though often fraught with challenges, is also filled with stories of courage and the enduring power of self-acceptance. Through "Copenhagen - The Painted Truth," the episode pays homage to the struggles and triumphs of Lili Elbe and the transgender community, providing a respectful acknowledgment of their place in history, and giving Rebecca Root an opportunity to shine in a role that resonates deeply with her own identity.

Episode 7 - "The Id Monster": "The Id Monster" connects the vastness of outer space with the inner reaches of the human psyche. The Traveller, responding to an urgent but indistinct call for help, lands in 1969, amidst a time of technological wonder and tumultuous societal shifts. She arrives at an isolated research facility tapping into the unknown potential of the mind, harnessing extraterrestrial technology to ostensibly advance human capabilities and breach the barriers of time and space. However, as the experiment progresses, it becomes clear that the technology is not just creating a rift in the fabric of reality, but also manifesting the darkest aspects of human emotion--fear, aggression, and envy--into physical form. Drawing inspiration from "Forbidden Planet," the Traveller realizes that these "id monsters" are born from the unchecked subconscious of those within the facility, as well as from the broader societal anxieties of the era itself such as the Cold War tensions, societal upheaval, and the looming presence of technological advancement that could either save or doom humanity. As Rebecca Root's character delves deeper into the mystery, she must confront her own inner demons along with those of the others. Communication, understanding, and facing one's own fears become the tools to quell the chaos. With her guidance, they learn how to control their own emotions, closing the rift and allowing the facility's personnel to use their research for more benign purposes--like watching the historic Moon landings on television in a moment of camaraderie and shared human achievement. The episode would balance emotional introspection with the period's iconic elements, revealing how pivotal moments in history can influence human consciousness. With Root's portrayal of the Traveller watching the Moon Landings unconnected to the main story, the denouement offers a tranquil reflection on human potential and missteps, as well as the hope that even in moments of darkness, humanity can reach for the stars and achieve the seemingly impossible.

Incorporating elements inspired by the Montauk Project--an alleged series of secret U.S. government experiments rumored (though not substantiated) to have taken place at Montauk Air Force Station--adds a layer of conspiracy and mystery to the episode. Episode 7 Revised - "The Id Monster": As the 13th Traveller navigates her way to 1969, she is unwittingly drawn to a clandestine research facility. The facility, whispered to be the successor of the Montauk Project, is pulsing with high-energy experiments. This facility is engaged in precarious research, blending psi-experiments with extraterrestrial technology, hoping to affect global consciousness and shape socio-political realities. The 1969 setting is rife with significant historical moments that could be influenced by such a facility, including but not limited to: 1. The Vietnam War: This conflict was at its height, and a facility like this might seek to influence the morale of either side or even try to end the war through mind control or manipulation of key figures. 2. The Stonewall Riots: Marking a pivotal moment in the struggle for LGBTQ+ rights, such a facility could be interested in studying or even suppressing mass movements and social revolutions, aiming to understand or control the power of collective human emotions. 3. The Civil Rights Movement: With tensions still simmering and societal shifts underway following the significant events of the 1960s, experiments might be conducted with the intent of pacifying resistance movements or bolstering public opinion towards desired political outcomes. 4. The Space Race: In the race to assert supremacy in space exploration, the facility might be dabbling with ways to ensure or sabotage success in critical missions, tying into prestige and the strategic balance of power during the Cold War. As the Traveller uncovers the truth behind the facility's intentions, the staff unwittingly unleashes the darker side of the human subconscious--rendering tangible the fears, angers, and aggressions of the time. The events outside the walls resonate within, causing the 'id monsters' to manifest through the cracks of the space-time rift. Rebecca Root's character, with her unique insight and empathetic approach, teaches those within the facility the importance of acknowledging and mastering one's darker impulses rather than fearing or attempting to exploit them. In a race against time--and against the dangers of uncompromising ambition and ethical ambiguity--she manages to inhibit the threats and seal the rift before irreversible damage is done to the natural course of human history. As the episode closes, the Traveller stands among the facility's staff. They are united, not in fear or power, but in awestruck silence as they watch the Moon Landings on a flickering screen. Despite the nightmarish turn of events they just endured, this moment of collective human triumph serves as a reminder that when harnessed for good, the same passion and ambition that fueled the 'id monsters' can also propel humanity to its greatest heights. "The Id Monster" becomes a cautionary tale of power, ethics, and the human spirit interwoven with the fabric of significant historical events.

Certainly, incorporating nuanced references to significant events like the Stonewall Riots can add depth and contextual layers to the story, acknowledging the broader backdrop of societal change without it becoming the episode's central focus. Here's an approach to weaving these elements into "The Id Monster": Episode 7, "The Id Monster," further revised: As the Traveller and her companions investigate the research facility's experiments with the space-time rift, they become aware of the current events of 1969. Throughout the episode, they encounter staff members and possibly other individuals who have been affected by the experiments, providing natural opportunities to hint at what's happening beyond the facility's walls. 1. News Broadcasts: Over radio or television within the facility, there might be news reports on protests and confrontations in New York indicating rising tensions, without explicitly mentioning Stonewall by name. These could be shown in brief moments as the staff and the Traveller go about their investigations. 2. Personnel Discussions: Researchers or military personnel at the facility might be overheard expressing their opinions or concerns about the political climate of the time, including references to the social upheavals and struggles for rights. 3. Emotional Resonance: As the experiments escalate and the emotional manifestations grow more intense, the fears and feelings of closeted or marginalized staff present might inadvertently strengthen the entities. This could serve as a metaphor for the repressed emotions of the time leading up to the Stonewall protests--and the eventual eruption of those feelings into the public consciousness. 4. Subplots: There could be a subplot involving a minor character at the facility who is personally affected by the news of Stonewall or has ties to the LGBTQ+ community. This adds a personal angle to the social struggles of the era. Rebecca Root's Traveller, knowing the historical importance of Stonewall, might subtly acknowledge the riots. While engaging with the facility staff or the generated entities, she could express empathy for those whose fight for recognition and equality may go unnoticed by history but is no less crucial. "These waves of change you're feeling, they aren't just anomalies to be studied--they're people, real people, fighting for the right to exist openly," she might say, bringing both a gravitas and a thoughtful commentary to the underlying societal shifts. In the episode's climax, as the Traveller succeeds in calming the emotional tempest and sealing the rift, the news of the Stonewall Riots could be breaking as a backdrop, a hopeful note that out of hidden fears and anger can come the impetus for transformative progress. Such allusions ensure the Stonewall Riots' resonance within the episode, honoring the era's complexities while staying focused on the narrative's science fiction and psychological thriller elements. This technique maintains a respectful nod to pivotal historical movements that aligns with the Traveller's values and the series' ethos of reflecting on human experiences.

Thank you! The Traveller, as a character, embodies empathy, curiosity, and a respect for all forms of life and the diversity of experiences across time and space. Those attributes make her an ideal vehicle for delivering such meaningful and poignant messages. Rebecca Root's portrayal of the Traveller would add an extra layer of depth to the role, bringing her own life experiences as a transgender woman into her performance, undoubtedly making the character's understanding and empathetic responses all the more authentic and impactful. In this hypothetical series, "The Traveller" has the opportunity to address complex issues sensitively and insightfully while inspiring viewers with her wisdom and compassion, making each adventure not just an entertaining tale but a thought-provoking journey through the human condition.