Two scientists, two giant egos. One wears a tank...one is a tank. Tony Stark and Bruce Banner are science bros! And when a fellow big-brain goes missing, the two heroes take bets who can find him first! It's Amazing Race, Avengers-style, as Iron Man and Hulk embark on a global manhunt with the ultimate prize at stake...bragging rights! But what happens when a 20 million-year-old evolutionary catalyst infects the Hulk?