On TV Tonight, Monday 12/21/09: THE CLOSER, MEN OF A CERTAIN AGE, and more

I WANT A DOG FOR CHRISTMAS, CHARLIE BROWN – 8pm ABC

THE SING-OFF “The Finale” – 8pm NBC

HOUSE “Epic Fail” (Repeat) – 8pm Fox

HOW I MET YOUR MOTHER “Definitions” (Repeat) – 8pm CBS

ONE TREE HILL “Deep Ocean Vast Sea” (Repeat) – 8pm CW

ACCIDENTALLY ON PURPOSE “One Night Stand” (Repeat) – 8:30pm CBS

FIND MY FAMILY “Nadeau & Bashaw” – 9pm ABC

THE CLOSER “Dead Man’s Hand” – 9pm TNT

GOSSIP GIRL “The Freshman” (Repeat) – 9pm CW

LIE TO ME “The Core of It” (Repeat) – 9pm Fox

TWO AND A HALF MEN “The Mooch at the Boo” (Repeat) – 9pm CBS

THE BIG BANG THEORY “The Bath Item Gift Hypothesis” (Repeat) – 9:30pm CBS

CASTLE “Vampire Weekend” (Repeat) – 10pm ABC

CSI: MIAMI “Dead on Arrival” (Repeat) – 10pm CBS

MEN OF A CERTAIN AGE “Minds Eye” – 10pm TNT