Dollhouse Dollhouse

9:01 pm/ET FOX
The penultimate episode of the season finds a face familiar to Joss Whedon fans. Alan Tudyk, nice guy Wash on Firefly and Serenity, appears in the season's final two installments as the Dollhouse's designer, an agoraphobic whose anxiety is sure to be heightened when Ballard's investigation hones in on him. —Jeff Gemmill

10 pm/ET CBS
The math-drenched crime series celebrates its 100th episode with a knotty murder mystery that entangles Charlie to the point of obsession. Still smarting from an error that led to Don's almost-fatal stabbing, Charlie throws himself into tracking an off-the-radar serial killer he claims is responsible for two dozen seemingly unrelated murders. But no one believes him. To add insult to injury, David teams Charlie with a geeky amateur detective (a hilarious Josh Gad) who tracks aliens when he's not researching serial murders. —Tim Holland

Fairly Oddparents
8 pm/ET Nickelodeon
Timmy begins a three-part adventure in which he must save the Earth from a destructive dark hole known as the Darkness. (Parts 2 and 3 air on Saturday and Sunday.) A brave Timmy faces the challenges of finding mystical wands and escaping robotic soldiers known as Eliminators. Several Hollywood blockbusters are parodied as his quest takes him far and wide, even leading him to a KISS concert. Gene Simmons, Paul Stanley, Brendan Fraser and Patrick Warburton are all on hand to provide voices. —Jennifer Sankowski

9 pm/ET ABC
Although the parents in tonight's fifth-season finale have important positions at a local church, that doesn't mean their four children are little angels. In fact, these kids are so out of control that their violent behavior has been known to result in bloodshed. But short of any divine intervention, the task of playing peacemaker falls to Jo, who must also address the father's "spare the rod" approach to discipline. —Joe Friedrich

Paul Rodriguez & Friends: Comedy Rehab
11 pm/ET Comedy Central
On a good night, successful stand-up comics are known for how much they killed, often with a series of rapid-fire punch lines that can leave an audience in stitches. But Paul Rodriguez isn't going to rehab to reverse any homicidal tendencies. In fact, it might be viewers who are better off after Rodriguez and fellow Latino comics Shayla Rivera, Gene Pompa and Manny Maldonado prove that laughter, after all, is the best medicine. —Joe Friedrich