This thread is a gold mine, I hope it continues for a long time to come. Here are a few tfs I've checked for links here and haven't seen.
Big Wolf on Campus
Girl to Witch:
Girl to evil werewolf:
Superfriends
Wonder Woman and Wonder Twin to monsters:
Wonder Twin to vampire(from about 04:30):
Xena
Bacchae :
demon:
Mummies Alive, mummy-girl to cat-creature:
Spider Woman, SW to Spider-Vampire-werewolf-woman:
He-Man, Sorceress to Harpy (starting around 14:00):
http://www.joost.com/0078ltw/t/He-Ma...tor#id=0078ltw
Scooby Doo, Daphne to evil werewolf:
WinX, Bloom to Dark Bloom: