other Marvel Comics children, he has not appreciably grown up since the comics' stories of the 1960s. Billy's visible age also seems to waver back and forth between approximately eight and 13 years old, depending on the particular comic artist drawing the character. Other versions Amazing Spider-Man: Renew Your Vows In this reality, Billy used the Lizard serum on himself and is mutated like his father (though he is not as in control of himself as Curt). Curt and Billy try breaking into high tech facilities in an attempt to find Regent's tech to turn Billy back to normal, but are thwarted by Spider-Man and his daughter Spiderling. After defeating the reptilian father and son at Oscorp, Spider-Man contacts the Fantastic Four for help in curing Billy's condition. Ultimate Marvel The one comic storyline to date featuring the Ultimate Marvel universe version of Lizard appeared in Ultimate Marvel Team-Up #10. The character has appeared in a few subsequent issues of Ultimate Spider-Man, but only in flashbacks and dream sequences. Lizard appears to be based on a basilisk lizard in design and has been presented as being less intelligent than the original Marvel iteration. Dr. Curt Conners is a noted geneticist who lost his right arm under unrevealed circumstances. He dedicated himself to finding a means of restoring lost limbs by studying the regenerative capabilities of reptiles. However, after five years without major breakthroughs, his sponsors were on the verge of cutting his funding. Drowning his disappointment with alcohol, a drunken Conners injected himself with an experimental serum in a desperate attempt to achieve results. The serum regenerated his right arm, but also transformed Conners into an inhuman reptilian creature. Seeking refuge in the sewers, he became an urban legend dubbed "the Lizard" by the press. Spider-Man sympathetically sought out Lizard who attacked the young hero until Man-Thing happened upon the scene and restored Conners to human form. Conners' restored right arm soon withered and died. However, his DNA remained irreparably damaged with dormant potential for further transformation. Conners cut himself off from his wife and son out of fear for their safety. Dr. Conners also unintentionally created the Ultimate version of Carnage using DNA from Spider-Man and based on an analysis of his old friend Richard Parker's work on the Venom symbiote. Due to the ensuing chaos, he was arrested and Stark Industries canceled their financial support of his experiments,