Monday, 8-8:30 p.m., CBS
The warlock has left the building. With the spectacular, bridge-burning, jumping-down-
the-inflatable-
emergency-slide exit of Charlie Sheen from Two and a Half Men, the show's raunchy, hedonistic playboy is gone — and with him, the show's primary source of bawdy jokes. Now a younger, hipper, prettier model is here. But can he be funnier, too? Five years after That '70s Show, Ashton Kutcher returns to sitcom TV as Walden Schmidt, a brokenhearted Internet billionaire who has no game with the ladies. Schmidt presumably takes over the now-deceased Charlie Harper's Malibu pad, thrusting Alan (Jon Cryer) into the unfamiliar role of giving love lessons. ''I'm a terrible mentor,'' Cryer says, ''and that's where a lot of the fun of the show comes from.'' Sept. 19

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