8 p.m., CBSCobie Smulders) cause Barney (Neil Patrick Harris) and Ted (Josh Radnor) to fight—even though Robin doesn't love either of them anymore.
8 p.m., FOXHugh Laurie) and his team try to diagnose a man whose fiancee won't stop grilling him about a past relationship. More importantly, they also bust out their best Gladys Knight and the Pips impression at a karaoke bar.
8 p.m., NBCZachary Levi) and Sarah (Yvonne Strahovski) shadow a married team of CIA agents (guest stars Swoozie Kurtz and Fred Willard, a.k.a. the busiest man on TV).
Season 2 premiere, 10 p.m., BRAVO
10 p.m., SHOEdie Falco) reignites her affair with Eddie (Paul Schulze)—and finds out that Dr. O'Hara's lover (Julia Ormond) has been cheating on her.
Also on the airwaves...
Dancing with the Stars, 8 p.m., ABC
One Tree Hill, 8 p.m., CW
10 Things I Hate About You, 8 p.m., ABC Family
Rules of Engagement, 8:30 p.m., CBS
The Big Bang Theory, 9 p.m., CBS
24, 9 p.m., FOX
Gossip Girl, 9 p.m., CW
Intervention, 9 p.m., A&E;
Romantically Challenged, 9:30 p.m., ABC
Castle, 10 p.m., ABC
CSI: Miami, 10 p.m., CBS
Law and Order, 10 p.m., NBC
United States of Tara, 10:30 p.m., SHO
MLB Baseball: Angels v. Red Sox
NHL Hockey Playoffs: Flyers v. Bruins, Canucks v. Blackhawks
What are you watching tonight?
Follow TV.com writer Stefanie Lee on Twitter: @StefAtTVDotCom