Polymorph

This Story: Season 3, Episode 3
Overall: Story 15, Episode 15
Airdate: 28 Nov 1989
Written by Rob Grant & Doug Naylor
Directed by Ed Bye

There is a remastered version of this episode, but I will be using the original version.
This episode carries a warning before the titles, saying certain scenes aren’t good for younger children, ending with “you have been warned”. I remember on first viewing thing, “Wow, what’s this going to be?”
The remastered version of the episode does away with the pre-titles warning.
The actress who played “Jenny” (the genetic mutant) was Frances Barber. She was in Doctor Who as “The Eyepatch lady” in a handful of Matt Smith episodes (Wedding of River Song was one).
There was a sequel to this story a few seasons later titled “Emohawk: Polymorph II“, but it wasn’t nearly as a good as this one.