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"Night of the Were-Diesel" is the twenty sixth episode of Best Friends Whenever. It premiered in October 2, 2016.

Synopsis

When Cyd tries to protect Diesel from Barry's wolf serum experiment, she accidentally gets the serum on herself and turns into a menacing werewolf. Now Shelby must try and figure out how to get her best friend back before the she-wolf destroys their high school's Halloween carnival.