NFL (6:30 p.m., ESPN): Ravens at Steelers

Big Bang Theory (7 p.m., Ch. 2): Leonard dates Sheldon's enemy.

Dancing with the Stars (7 p.m., Ch. 4): The remaining teams perform.

Terminator: Sara Connor Chronicles (7 p.m., Ch. 13): Cameron forgets who she is.

Gossip Girl (7 p.m., Ch. 30): Blair sabotages her mom's fashion show.

How I Met Your Mother (7:30 p.m., Ch. 2): Marshall meets Regis Philbin.

Two and a Half Men (8 p.m., Ch. 2): Alan lends Charlie money.

Heroes (8 p.m., Ch. 5): Villains take hostages.

CSI: Miami (9 p.m., Ch. 2): The high price of gas leads to murder.

Boston Legal (9 p.m., Ch. 4): Alan sues a drug company for deceptive advertising.

Life (9 p.m., Ch. 5): Three trunks containing dead bodies are found. (Season premiere)