Jack Arnold (The Wonder Years)
Oh, the nostalgia! Jack Arnold (Dan Lauria) from The Wonder Years is the kind of TV dad we could never forget. The war veteran who was generally a gruff and stern father, but that didn't mean he wasn't a good one.
Jack Bristow (Alias)
Who can forget Jack Bristow from Alias? Played by Victor Garber, Jack is tough and generally cold, but he's willing to do absolutely anything to protect his daughter Sydney.
Jack McFarland (Will & Grace)
The flamboyant and often self-absorbed Jack McFarland (Sean Hayes) never failed to make us laugh on Will & Grace. The good news? This memorable character is one we'll get to see again, since NBC has ordered a revival of the sitcom.
Jack Tripper (Three's Company)
Unlike Jack McFarland, Jack Tripper, played by the late John Ritter (RIP) isn't gay, but he does have to pretend to be in order to live with his two female roommates. Hey, you do what you have to do, right?
Jack McCoy (Law & Order)
Law & Order's Jack McCoy is so important that he was declared a "Living Landmark" by the New York Landmarks Conservancy. He's ruthless, unconventional, and a darn good lawyer.
Jack Abbott (The Young & The Restless)
To say that Jack Abbot has been through a lot (and caused his share of trouble) would be a serious understatement. First played by Terry Lester and now by Peter Bergman, The Young & The Restless character has been a TV staple since 1980.