Dark Bunny

  The Dark Bunny is the sequel to Bionic Bunny. The show scares D.W., and Arthur (although he does not admit it, was also afraid of the show when he first started watching it.) In "The Last of Mary Moo Cow," Dark Bunny was cancelled in order to make room for Mary Moo Cow.

Although first said to be cousins, it is later revealed that he and Bionic Bunny are twin brothers. When Bionic Bunny and Dark Bunny were born, the two were separated at birth (revealed in the episode "Happy Anniversary"). Dark Bunny was taken by an evil witch (making him darker), and Bionic Bunny was taken by a robot.

Although the Dark Bunny show did not start until "That's a Baby Show!," the episode "Double Dare" reveals that the superhero poster in the Tree House (which has been there since Season 1) is of Dark Bunny.

In "Hic or Treat", he meets Mary Moo Cow and she helps him be less dark and scary.