14. Leslie Mann
Leslie Mann, otherwise known as the go-to-girl for any Judd Apatow film, is bound to be forgotten. Shes a strong actress, but Apatow has much stronger, household names attached to his films. Her biggest roles also feature Paul Rudd and Seth Rogen for example, much bigger and memorable stars. She needs to be given more starring roles. This Is 40 was an alright start, but again, that was billed as the largely forgettable, sort-of sequel to Knocked Up, which is Seth Rogens film. And Funny People was a train wreck, and ironically, not very funny. And the problem with Rio is that people will remember that film for the talking blue parrot, not the actress voicing the little girl who adopted him. Its a shame, because as I said, shes a brilliant comedic actress. But shell forever be living in Apatows shadow unless she stretches her legs a bit.
13. Sam Worthington
Sam Worthington starred in the highest grossing film of all time, Avatar. So why will he be forgotten? Because Avatar means much more to James Camerons career than it does his. Also, Avatar will be largely remembered for helming the 3D movement, as opposed to Worthingtons performance. Worthingtons not really done anything of any note since. He starred in those Titan films, but they were panned by critics and disappeared rather quickly from the box office. Hes a fairly reliable draw for a juicy, action film. But other than that, hes fairly forgettable. Plus, juicy, action actors are a dime a dozen. He can easily be replaced, and in all honesty, he probably will be within the next couple of years.