The other two Doctors follow him with the intention of helping him detonate the Moment. When Clara insists they do not destroy their people, the Doctors devise an alternative solution. The Doctors, aided by ten of their other incarnations, plan to use the stasis technology to freeze Gallifrey in a pocket universe. When Gallifrey disappears, the surrounding Dalek warships would obliterate themselves in the inevitable crossfire. After Gallifrey disappears, the Doctors and Clara return to the Gallery, unsure whether the plan worked. The War and Tenth Doctors realise they will not remember what happened; they will continue shouldering the guilt. The War Doctor begins to regenerate after leaving. Hinting that the plan worked, the gallery's curator reveals to the Eleventh Doctor that one of the three-dimensional paintings is called "Gallifrey Falls No More". The Eleventh Doctor vows to find Gallifrey. As the show's 50th anniversary special, the episode contains a multitude of references to previous episodes. It opens with the title sequence and theme arrangement used at the series' debut in 1963. Echoing the opening of "An Unearthly Child", the first episode of the first "Doctor Who" serial, a policeman is shown walking past the sign for I.M. Foreman, the scrap merchant in whose yard the TARDIS was located, and its first few seconds are in monochrome (as had been the case in "The Two Doctors" (1985), the last time more than one Doctor had featured in an official story). Coal Hill School, which the Doctor's granddaughter Susan Foreman attended when they were on Earth in 1963 in the very first story, also featured in the 1988 serial "Remembrance of the Daleks". According to the school sign, the chairman of the school governors is now Ian Chesterton, one of the First Doctor's original three companions and a science teacher at the school, and the headmaster is W. Coburn, a reference to Waris Hussein and Anthony Coburn, who respectively directed and wrote "An Unearthly Child". Clara rides out of Coal Hill School on the Eleventh Doctor's anti-gravity motorcycle from "The Bells of Saint John" at 5:16, the time "An Unearthly Child" originally aired on BBC TV (the first broadcast began 1 minute 20 seconds after its scheduled time of 17:15 GMT on 23 November 1963). When the TARDIS is picked up by UNIT, the call sign used by the helicopter to refer to UNIT is "Greyhound leader", reflecting that of Brigadier Lethbridge-Stewart, whose daughter Kate is now portrayed as having his role as commander of UNIT.