May sweeps has officially arrived. For TV fans that means a full month of explosive season finales, jaw-dropping cliffhangers and -- best of all -- a long list of famous guest stars from both the big and small screens.

Among the A-listers you'll see this season: a daytime TV queen (Elisabeth Hasselbeck), a 'Star Trek' icon (Leonard Nimoy) and a two-time Oscar winner (Jodie Foster) who will finally let Maggie Simpson do the talking.

Check out our guest stars gallery to see when all of Hollywood's finest will be sweeping their way onto your favorite TV shows.

He helped E.T. phone home, and now former child actor Henry Thomas will be appearing on CSI as a convicted murderer that is serving a prison sentence. You keep hearing about child stars who go bad, but judging by his IMDB profile, Thomas has managed to keep out of trouble and keep working.

I'm glad Thomas had a more normal childhood than his movie co-star Drew Barrymore. Of course, Drew ended up becoming a bigger name in show biz, but the business is fickle and this appearance could set Thomas into more visible roles. Wouldn't that be a hoot if Thomas and Barrymore appeared once more together in a television show or movie (besides reunion shows)? If he's not done raping the stuff he made 20 years ago, perhaps Spielberg could do a sequel to E.T.

On second thought, that's a really bad idea. Let's leave the past in the past.