Floor 0507
Floor 0507, or more simply Floor 507, was a floor on a Mondasian colony ship. Serving as the largest of the ship's solar farms, (TV: World Enough and Time) it became the location of the final battle between its Mondasian inhabitants and an army of Cybermen from Floor 1056 that were determined to convert the Mondasians and complete Operation Exodus. Following the Mondasians' evacuation to Floor 0502, the Twelfth Doctor ignited all the fuel underneath Floor 0507, destroying the Cybermen at the cost of his near-death and the incineration of the entire solar farm. (TV: The Doctor Falls)
History
Time dilation
When the colony ship almost flew into a black hole, each of the ship's floors was affected by time dilation. (TV: World Enough and Time) Located near to the middle of the ship, time travelled faster on Floor 0507 than on the floors above, but slower than on the floors below. (TV: The Doctor Falls)
When the colony ship almost flew into a black hole, it was affected by time dilation. (TV: World Enough and Time) As it was located close to the middle of the ship, time on Floor 0507 moved faster than on the upper floors, such as Floor 0000, but slower than the lower floors, such as Floor 1056.
Attack of the Cybermen
While the Mondasians of Floor 1056 began evolving into Cybermen as part of Operation Exodus, a patrol of patients was sent to Floor 0507 to capture its Mondasian population for cyber-conversion. However, the patrol never returned to Floor 1056, as the patients were shot down by the adult farmers at night before being chained to crucifixes in the fields during the day. However, the patients would break free at night and resume their original mission, forcing the Mondasians to constantly fight off the patients at night and enchain them again in the day. (TV: The Doctor Falls) For her own protection, Alit, a young girl, was sent by her parents to live in a large farmhouse on Floor 0507 with the adult farmers and the other children. (PROSE: Alit in Underland)
The day after another patient attack, Alit observed a shuttlecraft crash-land on Floor 0507. She encountered its crew - Nardole, the Saxon Master, Missy, and a cyber-converted Bill Potts carrying an unconscious Twelfth Doctor - who had escaped from Floor 1056 after its Mondasian inhabitants had evolved into Mondasian Cybermen and attempted to kill them. (TV: The Doctor Falls)
The floor eventually came under siege from the Cybermen, who had manage to fully evolve themselves and had committed entirely to Operation Exodus, planning to conquer all of the colony ship. However, Nardole used a computer to hack into the fuel lines of the solar farm, detonating them to destroy the first wave of Cybermen, buying the residents enough time to evacuate to floor 502, another solar farm. The Doctor and Bill stayed behind to confront the next group, the Doctor eventually igniting the entire floor, destroying the majority of the Cybermen. The resulting explosion left the floor an uninhabitable wasteland, now littered with the remains of various models of Cybermen. (TV: The Doctor Falls)
Behind the scenes
Floor 0507 was named in tribute to previous showrunner Russell T Davies who, according to Steven Moffat, has a tendency to use the number "57" when making exaggerated claims.
This number has made it into RTD-era scripts, including TV: Boom Town, Army of Ghosts, The Shakespeare Code, 42, Voyage of the Damned and The Poison Sky. Death of the Doctor, a script penned by Davies for The Sarah Jane Adventures, has the Eleventh Doctor claim he has 507 regenerations.
