The Originals

Nathaniel Buzolic, the actor portraying the role of Kol Mikealson, auditioned and was almost cast as Stefan Salvatore in Crónicas vampíricas (2009).

Daniel Sharman played a werewolf in Teen Wolf (2011), and is now playing a witch. This is the opposite of Phoebe Tonkin, who played a witch on The Secret Circle (2011) and is now playing a werewolf.

Nathan Parsons who plays the werewolf Jackson, left the show during season one to play a vampire on HBO's True Blood (2008) only to return to his werewolf character in season two after the series ending of "True Blood".