Heroes, Castle, and The Big Bang Theory

Here's what we'll be watching ...

8 a.m., ABC

Good Morning America

The cast of Ally McBeal reunites during the 8 o'clock hour! Relive the memories -- if you can get up early.

5 p.m., TCM

Vertigo

Enjoy a couple of Alfred Hitchcock's masterpieces -- Vertigo with Jimmy Stewart airs first, followed by North by Northwest with Cary Grant at 7:15 p.m.

8 p.m., NBC

Heroes

Hiro (Masi Oka) travels three years into the past in an attempt to save Charlie (Glee's Jayma Mays) -- but he runs into Samuel, too.

9 p.m., CW

Gossip Girl

Jimmy Fallon is all over the place these days! First, he showed up on 30 Rock, and now he's interviewing Olivia (Hilary Duff) on Late Night -- but she slips up during the one-on-one.

9:30 p.m., CBS

The Big Bang Theory

Sheldon (Jim Parsons) and Leonard (Johnny Galecki) discuss football, and Raj (Kunal Nayyar) and Howard (Simon Helberg) fight about ... kites?

10 p.m., ABC

Castle

An up-and-coming rock star is found dead -- and Castle (Nathan Fillion) and Beckett (Stana Katic) look to the rocker's song lyrics for clues.

Also on the airwaves ...
Dancing with the Stars, 8 p.m., ABC
How I Met Your Mother, 8 p.m., CBS
One Tree Hill, 8 p.m., CW
Lincoln Heights, 8 p.m., ABC Family
Accidentally on Purpose, 8:30 p.m., CBS
Two and a Half Men, 9 p.m., CBS
Trauma, 9 p.m., NBC
Greek, 9 p.m., ABC Family
CSI: Miami, 10 p.m., CBS
Cake Boss, 10 p.m., TLC

What are you watching tonight?