Zelena (Once Upon a Time)
In December 2013, Rebecca Mader was cast as the Wicked Witch of the West. She made multiple appearances during the second half of season three and was promoted to a series regular for the show's fifth season. The role of the Wicked Witch of the West was written specifically for Rebecca Mader. It was announced that the writers had chosen not to continue with Zelena's storyline and Mader would not be returning for the seventh season of the show. However, Mader later revealed that she would be returning for multiple season seven episodes.
Radek Zelenka
Zelenka recurs in all five seasons of "Stargate Atlantis" and is also among the "Atlantis" characters to appear in the "Stargate SG-1" crossover episode "The Pegasus Project". In his first appearance in the early "Atlantis" season 1 episode "Thirty-Eight Minutes", Zelenka helps devise a plan to free Major Sheppard's team including Dr. McKay from a potentially lethal technical problem. After a first short collaboration in "Suspicion", Zelenka and McKay are the driving forces in finding a solution to protect the city of Atlantis from a massive hurricane in "The Storm".