“chuck” (8 p.m., abc): For five years, the lowly rated comedic action series,

“chuck” (8 p.m., abc): For five years, the lowly rated comedic action series, “Chuck,” defied the odds to stay on the air. But it all comes to an end tonight when our geek-turned- secret agent (Zachary Levi) says good-bye in back-to-back episodes. Of course, he’ll first have to make it through one last perilous mission.

“spartacus - vengeance” (10 p.m., starz): Tonight brings the premiere of “Spartacus: Vengeance” with new lead actor Liam McIntyre replacing the late Andy Whitfield as the rebellious gladiator. But some things never change: The series will still be on blood-and-sex overload.

tv listings: B6

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