Go Fish

"Go Fish" is episode 20 of season 2 of the television series Buffy the Vampire Slayer.

Xander goes undercover on the Sunnydale swim team after members begin turning up dead, after apparently being skinned alive.

The swim-team coach gives fish/steroid cocktails to the swim team to get them to perform, but turns them into sea monsters. Buffy confronts the coach, and he is killed by the swim-team sea monsters.

Quotes and trivia
The "fish people" in this episode strongly resemble the Silurians from Doctor Who and go into the sea at the end of the episode in a very similar shot to the Sea Devils, or aquatic Silurians, in the 1972 Doctor Who story.