Monday's TV Highlights: 'Gossip Girl' on KTLA
TROUBLE: Michelle Trachtenberg is back as the nefarious Georgina just in time for the third-season finale of the teen soap “Gossip Girl" at 9 p.m. on KTLA.
Chuck: "Quantum Leap's" Scott Bakula reprises his guest role as Chuck's (Zachary Levi) dad on a new episode of the action comedy (8 p.m. NBC).
One Tree Hill: The long-running drama presents its season finale (8 p.m. KTLA).
Dancing With the Stars: The final four teams hit the floor in this new episode of the reality competition (8 p.m. ABC).
House: The medical drama starring Hugh Laurie ends its season (8 p.m. Fox).
Castle: It's season finale time for this nifty mystery-drama starring Nathan Fillion and Stana Katic (10 p.m. ABC).
Bizarre Foods With Andrew Zimmern: Arizona is the latest destination on this culinary travelogue (10 p.m. Travel).
10 Things You Didn't Know About Earthquakes: This new special aims to shake things up with a dose of temblor-related trivia (5 and 8 p.m. National Geographic).
Supernovas: This new astronomically-minded special charts the death and afterlife of a star (9 p.m. Discovery).
Animal Planet Investigates: Petland: The shocking conditions at so-called "puppy mills" are investigated in a new exposé (10 p.m. Animal Planet).
D.E.B.S.: Sara Foster and Jordana Brewster star in this saucy 2004 action send-up (8 p.m. IFC).
Baseball: The Red Sox take on the Yankees (4 p.m. ESPN), the Angels play the Rangers (5 p.m. FSN) and the Dodgers host the Astros (7 p.m. FS Prime).
Basketball: The Lakers face the Suns in game 1 of the Western Conference Finals (6 p.m. TNT).
Photo credit: Giovanni Rufino The CW