Multiple choice general knowledge Find the odd one out Dr.Viper Dr.Doom The Past Master The Metallikats Reveal answer Fill a bubble to check yourself B Correct answer Explanation Dr. Doom is the odd one out as he is a Marvel Comics supervillain from the Fantastic Four series. Dr. Viper, The Past Master, and The Metallikats are all villains from SWAT Kats, a different cartoon universe entirely.