April 30, 2007 12:00 PM

Saturday Night Live (NBC, April 21, 11:30 p.m. ET) Now here’s a lineup: Scarlett Johansson, the gorgeous star and unlikely muse to Woody Allen, returns as host. Musical guest: Björk.

Celebrity Fit Club (VH1, April 22, 9 p.m. ET) This crop actually has potential: You’ve got ex-Idol Kimberley Locke and Dustin “Screech” Diamond from Saved by the Bell. Saved by the barbell, more like.

Idol Gives Back (FOX, April 24-25, 8 p.m. ET) American Idol devotes two nights to fund-raising for African poverty. Night Two features everyone from Daniel Radcliffe to Keira Knightley to—Borat? Plus someone goes home.

This American Life (Showtime, April 26, 10:30 p.m. ET) First-season finale of the beautifully odd news-magazine hosted by Ira Glass.

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