Every time DWAYNE JOHNSON stops by, Ellen finds another one of his fears -- whether it's tarantulas, roller coasters, or aliens sneaking up behind him! She'll see if there's anything else when he tells her about his new move, "Fast Five" -- which he filmed in gorgeous Rio de Janeiro!

You know MATTHEW MORRISON as the caring teacher on the smash hit "Glee," but you'll soon know him as an incredible solo artist! He's headed on tour for his debut album and will stop by to perform a song for Ellen.

There are few things more beautiful than a polar bear in its natural habitat -- and filmmaker JOHN DOWNER knows that first-hand! He created the new Discovery film, "Polar Bear: Spy on Ice" and will share some of the never-before-seen footage!