HDTV Listings for February 18, 2011

What we're watching tonight:

• Fox (720p) has Fringe at 9 p.m.

• CBS (1080i) has The Defenders at 8 p.m. and CSI: NY at 9 p.m. and Blue Bloods at 10 p.m.

• CW (1080i) has Smallville at 8 p.m. and Supernatural at 9 p.m.

• NBC (1080i) has Who Do You Think You Are? at 8 p.m.

• Discovery (1080i) has Flying Wild Alaska at 9 p.m. and the season finale of Gold Rush: Alaska at 10 p.m.

• Syfy (1080i) has WWE Smackdown at 8 p.m. and Merlin at 10 p.m.

• Starz (1080i) has Spartacus: Gods of the Arena 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.

• IFC (1080i) has Onion News Network at 10 p.m. and Portlandia at 10:30 p.m.

• TNT (1080i) has the Rookie Challenge and Youth Jam at 9 p.m.

• ESPN (720p) has UCONN/Louisville college basketball at 9 p.m.

• ESPN2 (720p) has VCU/Wichita State college basketball at 7 p.m.

• ESPN2, ESPN 3D (720p) has Friday Night Fights at 9 p.m.