Video: Scarlett, RDJ, And More Talk Avengers, Muppets, HIMYM, And Grey's Anatomy! Video

Scarlett Johansson and Robert Downey Jr. popped up at Disney's D23 Expo over the weekend to represent for The Avengers, while Jason Segel promoted The Muppets and talked to us about the new season of How I Met Your Mother. Hear all about that and more in today's PopSugar Rush!