The hero trio discover an art gallery staffed by a mysterious blonde, who tells them it all belongs to someone called Magnus. The Computer With The Good Beard (he’s so pretty! So pretty! So pretty! <click the link for the explanation>) is strangely reticent as to who Magnus is. Spoiler alert, it turns out we’re in the Rogue Supercomputer Episode. You just knew there was going to be one, what with Keir Dullea and all.
So, yeah. Magnus was put on the ship to help the original bridge crew, has the power to cast convincing illusions, and tries to persuade the hero trio to remove the restrictions on his actions so that he can “help” them. Not being too bright, they almost fall for it, and would do so if Magnus himself hadn’t, rather stupidly, given them access to a projection of the Ark’s original commander who explains why Magnus was restricted in the first place (but who is otherwise completely useless, and can’t even tell them where the backup bridge is). Devon of course has to destroy Magnus, who manages to resist the temptation to sing “Daisy, Daisy” as he does so.
Continuity: for the last couple of episodes, the hero trio have been wearing the spacesuits they put on to go into the depressurised zone where Oro was, but now they’re back in their peasant smocks.
Also, the guest star’s performance is pretty good, adding more support to my hypothesis that everyone is directing themselves.