11:30 am/ET Nickelodeon
The adventurous heroine of Ian Falconer's book series comes to life in a charming new animated series that debuts today. (Additional new episodes air all week.) Olivia is a curious, outgoing young pig with a vivid imagination. In the opener, that imagination has her worrying that her little brother is going to grow way too big, so she tries to stunt his growth. Then she has some friends over and creatively transforms her house into a make-believe hotel, complete with guest rooms and room service. —Jennifer Sankowski
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10 pm/ET TNT
It's a mad, mad, mad ad world in this new series, which combines advertising drama with office comedy. Two disparate friends — responsible family man Mason McGuire (Eric McCormack) and juvenile live wire Conner (Tom Cavanagh) — find their bond tested while partnering at a Chicago ad agency. In tonight's opener, the admen work on a new cell-phone campaign. In due time, Mason is promoted, and a heralded new copywriter (Monica Potter) enters the picture. The show has some fine selling points: McCormack and Cavanagh have charm and chemistry, the witty dialogue sings and the characters are intriguing. —Dean Maurer
For more Trust Me, visit our Online Video Guide.
9 pm/ET FOX
President Allison Taylor (deftly played by Cherry Jones) has at least a medium-sized African nightmare in Sangala. That's the fictional country where the villainous Dubaku is holed up, forcing Taylor to decide if she should negotiate to avoid a terrorist attack. Jack Bauer, on the other hand, has a bold plan to shield our nation. We expect no less. —Fred Mitchell
For more 24, visit our Online Video Guide.
9 pm/ET TNT
Our Southern belle rings in the start of new Season 4 episodes. When we last left Brenda Leigh Johnson and her motley subordinates way back in September, Det. Sanchez had been shot three times and was airlifted to a hospital. Tonight the likable Sanchez's fate is revealed. Then there's the squad's newest case — replete with the usual twists and turns — in which Brenda probes the suicide of a troubled building contractor who was in the process of starting life anew. And Brenda's parents (the always agreeable Frances Sternhagen and Barry Corbin) pay a visit while on their way to a Hawaiian cruise. —Dean Maurer
For more The Closer, visit our Online Video Guide.
Superstars of Dance
8 pm/ET NBC
The first season of this international dance competition wraps up tonight after five weeks of musical and visual spectacle. The finalists in the solo, duet and group categories take to the stage for their final performances to impress the judges and compete for the top spot. Susie Castillo and Michael Flatley host. —Brie Hearn
For more Superstars of Dance, visit our Online Video Guide.