on the dalek ship, vicki witnesses the daleks' replicator machine in action: an android replica of the doctor is produced and is programmed to kill the original doctor and his companions. when the dalek ship arrives on mechanus, the robot killer is dispatched. the jungle is hostile, with large fungoid plants, which attack humans and only retreat when exposed to light. after a while the four travellers are reunited but the robot doctor also appears. both doctors claim to be real one and a fight ensues between ian and the real doctor. the robot doctor mistakenly calls vicki by the name of susan. barbara realises the mistake and yells at ian that this is the robot. the real doctor disables it with his stick.