The Ripping Friends S01 E12 The Man from Next Thursday, Part 1

Someone breaks into RIPCOT's secret vault and steals the Ripping Friends' "perfect" DNA, which he turns into "Riptonite" in order to kill the Ripping brothers. The intruder is revealed to be a man with an enormous thumb protruding from his chest, who claims to be a time traveler from "next Thursday".