Tonight on TV

• Master of Champions (7 p.m., Ch. 4): A break-dancer and a martial artist compete.

• My Name is Earl (7 p.m., Ch. 5): Earl must help Joy's former nemesis. (Repeat)

• Smallville (7 p.m., Ch. 30): Lex and Lana are taken hostage. (Repeat)

• The Office (7:30, 8 and 8:30 p.m., Ch. 5): A trio of repeats.

• Rock Star: Supernova (8 p.m.,. Ch. 2): The finalists compete.

• Grey's Anatomy (8 and 9 p.m., Ch. 4): In the fall, new episodes of this hit show will be seen Thursdays at 8 p.m. Tonight, we get a couple of repeats.

• So You Think You Can Dance (8 p.m., Ch. 13): Two contestants are eliminated.

• Supernatural (8 p.m., Ch. 30): Sam and Dean investigate a haunted asylum. (Repeat)

• CSI (9 p.m., Ch. 2): A murder case is compromised when the evidence is stolen. (Repeat)

• Windfall (9 p.m., Ch. 5): Frankie's father is involved in an accidental shooting.