Russ (A Rose by Any Other Name)

Russ was a character on the television show Chums.

Whilst filming the show's final episode in 2014, the actor who played him suddenly turned into a frog, as a side-effect of Rose-the-cat trying to create a cat flap in the Doctor's TARDIS. (COMIC: A Rose by Any Other Name)

Behind the scenes
Russ is a clear parody of the Friends character.