In 1911, he found the Fourth Doctor and Sarah Jane Smith in the wing of the mansion that Namin had closed off. Thinking they were friends of Dr Warlock who had come to investigate the mansion, he told them to watch out for Namin, who he said had "the temper of the devil himself".
He later had the Doctor and Sarah exit through the window so Namin didn't find them. However, while watching them leave, Collins was attacked and killed by an Osirian service robot. (TV: Pyramids of Mars)