Episode 2×17 of the AH.com Series. Written by Doctor What. One of the funniest episodes ever! Hey, it has lesbian Asian ninjas in leather!

Also one of the most disturbing episodes of all time, particularly a certain infamous scene with Mirror Luakel...

The Evil Mirror AH.com crew (Mirror Thande, to be specific) has botched an experiment and thus changed their genders. The only way how to correct that (although some members of the mirror crew enjoy their new state) would be to obtain unchanged DNA from somewhere. So they attack the original AH.com ship...