Cydney "Cyd" Ripley is one of the main protagonists from Disney Channel's Best Friends Whenever. Cyd served as the main villainess in Season Two's "Night of the Were-Diesel."
She is played by Landry Bender.
In the episode, Cyd's dog, Diesel, accidentally consumes Barry's invented wolf-serum and becomes a half-wolf monster going after both Cyd and Shelby. During the encounter, Diesel hurls the serum at Cyd. The protagonists successfully travel back in time to prevent Diesel from getting into the serum, but during the preparation for the school's Halloween party, Cyd feels the effects of the serum and turns into a werewolf.
After letting out a demonic howl at a (fake) full moon, Cyd turned heel and snarled at Shelby before going after her with intentions on devouring her. The she-wolf chased Shelby to Barry's educational maze, where she is found her with Barry and Naldo. At that moment, the evil Werewolf Cyd trapped the trio in a dead end, where Shelby attempted to get through to Cyd, with success. Cyd regained control of her urges, but remained her werewolf form for the remainder of the episode.