Maxtible is tricked into walking through an archway that infuses him with the Dalek Factor, mentally turning him into a Dalek. He hypnotises the Doctor and lures him through the arch as well, apparently converting him. However, the Doctor is feigning his conversion and secretly plants a device on the arch while the Daleks hunt for the three "human" Daleks. As one still remains to be found, the Doctor suggests that all the Daleks be put through the conversion arch so that the "human" Dalek will once again be infused with the Dalek Factor.