TONIGHT'S MUST-SEE

"The Murder of Princess Diana," 6 p.m., Lifetime. Like Oliver Stone's "JFK," this tries to put conspiracy theories into a scripted movie. It goes a step further, though, inventing characters and having things happen to them. The tale is well-crafted, with Jennifer Morrison ("House") excellent in the lead. Still, it clouds the film's chance at answering a key question: How could a high-profile police investigation be botched in so many ways?

OF NOTE

"The Lord of the Rings: The Two Towers" (2002), 5 p.m., TNT; and "Pleasantville" (1998), 8 p.m., E! There are several good movies tonight, plus these two great ones.

"The Cat in the Hat" (2003), 7 p.m., ABC. Mike Myers stars, as the wonderful Dr. Seuss book becomes a noisy movie.

"America's Got Talent," 7 p.m., NBC. If you missed Tuesday's finale, here's a quick rerun. The final-four lineup has two singers (one of them 14), a ventriloquist and a beatbox performer. After lots of other performances, one will win $1 million.

"Ghost Whisperer," 7 p.m., CBS. A box of ornaments sends messages to Melinda.

"Bob Saget: That Ain't Right," 7 p.m., HBO. When delivered with wit, in the Richard Pryor or George Carlin style, harsh words can be hilarious. When delivered witlessly, Saget style, they are merely annoying.

"Disney Channel Games" closing ceremony, 8 p.m., Disney Channel. The games end the way they began, with upbeat music. Performers are the Cheetah Girls, the Jonas Brothers and, of course, Miley Cyrus.

"Masters of Science Fiction: The Discarded," 9 p.m., ABC. This interesting, four-week series ends with a Harlan Ellison tale about disfigured outcasts who must wander outer space or agree to a harsh bargain. James Denton, Brian Dennehy and John Hurt star; the director was Jonathan Frakes, who directed and co-starred in two "Star Trek" films.

"Medium," 9 p.m., NBC. Allison's brother, a telephone psychic, gets wrapped up in her case. That sibling theme extended behind the camera: The episode was directed by David Arquette, the brother of star Patricia Arquette.

"Saturday Night Live," 10:30 p.m., NBC. The show pauses to offer what it considers the best moments of this season.