stores to prevent more Cybermen entering. The cybership is located, but a large squad of Cybermen start advancing on the Moonbase. Two Cybermen on the surface damage the aerial, preventing the Moonbase from contacting Earth; however, a relief ship is on the way. The Cybermen use radio beams to reactivate their zombies inside the base, who infiltrate the Gravitron and use it to deflect the relief ship into the sun. A hole is blasted in the wall, which depressurises the base, but Hobson and Benoit use a coffee tray to plug the leak. The depressurisation deactivates Evans and the other zombies. Two more cyberships arrive. The Cybermen already on the surface erect a large laser cannon and threaten to blow the base open unless the entry port is opened within 10 seconds. They fire, but the beam is deflected by the Gravitron. Another large squad from one of the other cyberships take up positions around the base. With the help of Hobson, Polly and Benoit, the Doctor points the Gravitron at the lunar surface, which blasts the Cybermen and their ships into space. As Hobson and his team reorient the Gravitron to its proper use, the Doctor and his companions slip away. Back in the TARDIS, they dematerialise and then activate the rarely used time scanner to reveal a monstrous claw waving around. Production The working titles of this story were Cybermen and The Return of the Cybermen. It was commissioned before the last episode of The Tenth Planet was broadcast, to take advantage of the strong positive response to the Cybermen. When Pedler was commissioned to write a second Cyberman story, one of the requirements was that the story should have only one large set and a limited number of smaller sets. The first draft of the script was written before it was decided that Frazer Hines would be a regular cast member. As a result, the character of Jamie had to be worked into a script that didn't have much room for him. So in the first two episodes, Jamie spends much of the time in the sickbay. In the last two episodes, some of Ben's dialogue was given to him. The first three episodes were recorded on successive Saturdays at Doctor Who's then regular home of Riverside 1, but for Episode 4 it moved back to Lime Grove D. A final clip, used to carry the story