Zachary Quinto and Cristine Rose, Heroes Zachary Quinto and Cristine Rose, Heroes

Heroes
9 pm/ET NBC
The "Villains" volume wraps up tonight as the Petrelli family falls further into turmoil. With Arthur dead, Nathan is on the fast track to filling his poppa's shoes as he continues testing the formula to fulfill his vision of a new world. And it's up to Peter to stop him. Elsewhere, Ando, Matt and Daphne look for ways to rescue Hiro, who was last seen trapped sixteen years in the past — powerless and dangling from a very tall building. Gulp. — Brie Hearn

For full episodes of Heroes, visit our Online Video Guide.

20/20
9 pm/ET ABC
This isn't yet another High School Musical show — 20/20 is produced by ABC News, after all, so these are real-life kids (at Westfield High School in Chantilly, Va.) who are followed as they put on The Wiz. Backstage angst is a given, of course, and since Chantilly's a mostly white D.C. suburb, there's also some racial tension. Until opening night, that is. "I'm really surprised how much fun I had," says Cody Jones, who plays the Lion, "because of how much agony I had in the process." — Paul Droesch

For clips of 20/20, visit our Online Video Guide.

Two and a Half Men
9 pm/ET CBS
Charlie Sheen and brother Emilio Estevez collaborated in the 1990 film Men at Work, and now the men are at work together on Sheen's hit sitcom. In tonight's episode, Charlie takes a hard look at his pleasure-first lifestyle when an old friend and fellow womanizer, played by Estevez, dies. James Earl Jones also appears in a cameo. — Bill Ecklund

For full episodes of Two and a Half Men, visit our Online Video Guide.

Cat Dancers
8 pm/ET HBO
No, this isn't about the prancing felines from the 1970s "chow, chow, chow" commercials; in fact, it's as serious as a heart — or tiger — attack. Harris Fishman's directorial debut tells the decades-long story of a once-popular exotic-cat act, The Cat Dancers, through archival footage and a plethora of New Agey insights from the group's sole survivor, who explains the bond among the group's three performers that was severed forever by a pair of tragedies. — Joe Friedrich

For clips of Cat Dancers, visit our Online Video Guide.

Intervention
9 pm/ET A&E
After the network began to test the waters of reality programming, a few series managed to float to the surface and stay there — even if some of those series might have been of questionable taste. Intervention is one of the success stories, and also one that might cross some lines, considering its voyeuristic tendency to gape at lives in pain. The show returns tonight for a sixth season with an episode in which alcoholism is destroying a woman's life. — Bill Ecklund

For full episodes of Intervention, visit our Online Video Guide.