I was going to rewatch this, but reading @ 's rundown soured the memory of it a bit. It's an episode I've watched a bunch, and it has some elements I really like:

• The cat nun nurses, terrific makeup, crazy concept!
• The face of Boe, another wild and well executed idea.
• Cassandra! Probably the most iconic trampoline recurring villain in the early show. Even now, fans post cookies and embroideries in her likeness, even though she's visually and thematically horrible!
• Let's just add the Duke of Manhattan, too. What a throwaway character. And I like how his neck grates when he moves.
• And I like Chip, for some reason. In this bonkers rogues gallery, he's just a dude in scrubs with some paint on his face. Somehow that, a silly gait and the earnest, wide eyed acting is enough.

The allure of the body swap has worn off the more I watch this, though. Not a lot of actors can pull it off, much less so when the person they're impersonating is Zoë Wanamaker at her peak of campiness.

By now when I think back on this episode, I remember Billie Piper complimenting her own arse, and skip to the one with the werewolf instead. Oops, spoilers for next week's throwback discussion!

This is honestly not a terrific story as a whole — VS has already pointed out the biggest pratfalls — but at least it's so full of wacky characters and running away from human guinea pigs, you won't have time to say "that's not how medicines work".