Wonder Dog is a superhero dog who belongs to the teenagers Wendy Harris and Marvin White. This has made him a companion to the Super Friends. He possesses no super-powers or crime-fighting aptitude, but he does wear a cape. Wonder Dog was created by Alex Toth, first appearing in the Super Friends episode "The Power Pirate." (1973)Rex the Wonder Dog is an unrelated canine hero, a super-powered dog who fought in World War II. Green Lantern also had a pet called Streak the Wonder Dog.