Killer flying robots? No, not this time. Our fearless leader is back once again in Jimmy Fallon's guest chair, this time with a bunch of new holiday gear at his disposal. Other guests include Jason Segel (Gulliver's Travels), Hailee Steinfeld (True Grit), and Dr. Elmo himself performs "Grandma Got Run Over By A Reindeer." All the madness starts at 12:37AM tonight care of your local NBC affiliate... oh, and speaking of robots, don't forget to check out this week's Engadget Show while you wait.