On Tuesday night, Cartoon Network launches the live-action series "Tower Prep" (at 8 p.m.), about a budding teen hero who wakes up and discovers he's in a mysterious academy for kids just like him -- in other words, teens with "special abilities." However, because no one will tell him what the heck is going on, or why he was placed in the new school with no outside world contact, he bands together with several other suspicious students to uncover the secret.
"Nova" (WETA at 8) kicks off another season with "Building the Great Cathedrals," and looks at ancient cathedrals all over the world, including how they were built (some took about a century to complete) and whether they are on the verge of collapse.
A controversial shock jock and his guest (a naval officer) are shot and killed live on air on "NCIS" (CBS at 8), and the team tries to weed through the many suspects to find who's responsible.
One contestant gets a second chance on "The Biggest Loser" (NBC at 8) when players return to compete for one more spot on the ranch -- and whoever lost the most weight since the initial tryout wins the prize.
After TV theme song dance night, one celeb is out during "Dancing With the Stars" (ABC at 9) results, though not before Jason Derulo and Shakira perform.
New reality series "K-Ci and JoJo . . . Come Clean" (TV One at 9, 9:30) follows the R&B singers as they battle alcoholism through medical treatments and different kinds of therapy with help from professionals and friends.
Given that they went on their honeymoon with Cate's daughter, Cate and Ryan are desperate for some alone time when they decide to head to a local hotel on "Life Unexpected" (CW at 9). . . . Unfortunately, it's the same place where Cate's ex-fling, Baze, happens to be having a work function.
"Frontline" (WETA at 10) investigates the case of Cameron Todd Willingham, executed in 2004 after he was convicted in the arson deaths of his three daughters, and whether new scientific evidence suggests that the fire wasn't necessarily arson.
"Ghost Lab" (Discovery at 10) returns for another season, with the crew heading to Gettysburg, Pa., to seek out a house that has been filled with very strange noises and to try to contact some ghosts from the Civil War era.
While Peter's campaign continues to struggle under the pressure of many things going wrong at the same time, Alicia is suspected of an ethics violation that could present another major challenge to the campaign on "The Good Wife" (CBS at 10).
The premiere of "Freak Encounters" (Animal Planet at 10:30) sends unknowing people to help a crew examine unexplained creatures and then sends a terrifying animal their way to see what happens. First up? A man finds himself face to face with a mutant bat.
-- Emily Yahr