Vulcan's Rampage

Vulcan is a well-known hero throughout the Galaxy, created by the last of vulcanians to end the white Martian race after they unleashed a deadly virus onto the Vulcan race, causing them to go extinct though this is unknown to the rest of the universe. To the rest of the galaxy, Vulcan is an immortal hero who travels throughout the universe, helping those in need for thousands of years. So when he lands on Earth, J'onn and Kara welcome the hero with open arms, joining him on his quest to capture two criminal white Martians who J'onn and Kara have both faced before. But when they find the villains, Vulcan's programming kicks in; he tries to kill them and their child, forcing the heroes to protect the villains and face off against their hero.