Tom Hiddleston, a.k.a. Loki in Marvel's The Avengers and Thor: The Dark World, is in a new guest spot on Sesame Street, in which he teaches Cookie Monster an ever important lesson about delayed gratification by being withholding with a plate of cookies, because showing Cookie Monster a plate of cookies and not immediately giving him one is pretty much the most Loki thing you can do. "I just made the correlation between your name and what I'm about to eat," says Hiddleston. Do not trust a word he says, Cookie Monster. He is the god of lies.