What we're watching tonight:
- CBS (1080i) has The Defenders at 8 p.m., Super Bowl's Greatest Commercials at 9 p.m. and CSI: NY at 10 p.m.
- CW (1080i) has Smallville at 8 p.m. and Supernatural at 9 p.m.
- NBC (1080i) has the season premiere of Who Do You Think You Are? at 8 p.m.
- Fox (720p) has Fringe at 9 p.m.
- TLC (1080i) has Say Yes to the Dress at 9 p.m. and Four Weddings at 10 p.m.
- Discovery (1080i) has Flying Wild Alaska at 9 p.m. and Gold Rush: Alaska at 10 p.m.
- HBO (1080i) has The Ricky Gervais Show at 9 p.m., Real Time with Bill Maher at 10 p.m. and Funny or Die Presents at 11:59 p.m.
- Starz (1080i) has Spartacus: Gods of the Arena at 10 p.m.
- History (720p) has Modern Marvels at 9 p.m.
- Syfy (1080i) has Merlin at 10 p.m.
- IFC (1080i) has Onion News Network at 10 p.m. and Portlandia at 10:30 p.m.
- ESPN (720p) has an NBA doubleader with Mavericks/Celtics at 8 p.m. and Jazz/Nuggets at 10:30 p.m.
- ESPN2 (720p) has 2011 All-Star Football Challenge at 7 p.m. and Friday Night Fights at 9 p.m.