Home Improvement (7 p.m., Ch. 4): Randy (Jonathan Taylor Thomas) returns home for a visit.

Buffy the Vampire Slayer (7 p.m., Ch. 30): Shades of "It's a Wonderful Life" -- when Cordelia wishes Buffy had never come to Sunnydale, we discover what would have happened if she hadn't.Any Day Now (7 p.m., Lifetime): Annie Potts' former "Designing Women" co-star, Delta Burke, guest stars as her sister.

Invasion Earth (7 p.m., Sci-fi): This three-part, six-hour miniseries was produced by the BBC, so it's rather talky and takes a while to get rolling. The rather convoluted, confusing plot finds Earth caught in the middle of a war between two advanced alien races. This is pretty much for science-fiction afficianados only. (Continues Wednesday)

Spin City (8 p.m., Ch. 4): The staff competes to see who has the best costume for the mayor's charity ball.

Just Shoot Me (8 p.m., Ch. 5): Nina gets in a cat-fight with her fashion rival.

Felicity (8 p.m., Ch. 30): Felicity gets closer to Noel.

Sports Night (8:30 p.m., Ch. 4): The crew stages an all-night poker game.

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Greek Americans (8:30 p.m., Ch. 7): Well-made, interesting documentary about the Greek-American experience.

Dateline (9 p.m., Ch. 5): A report on the man who received the world's first hand transplant -- and the fact that he's a criminal awaiting trial.

NYPD Blue (9 p.m., Ch. 4): Sorenson goes over the top with a murder suspect.

Sugar Ray Robinson: The Bright Lights and Dark Shadows of a Champion (11 p.m., HBO): A profile of the boxer.

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