A handful of TV spin-offs have been wildly successful.

Take for example, the hit show "Frasier," which was spun off from "Cheers," or the slew of "CSI" and "Law & Order" spin-offs or "The Jeffersons" (from "All in the Family").

Unfortunately these success stories are few and far between. More often than not, TV spin-offs not only fail, but fail miserably.

Too many lovable characters have been ruined simply because someone decided they should live on forever. Some spin-offs fail because they change the character(s) too much, some fail by changing them too little, and some fail because they just flat-out stink.

Some failed so badly we hesitate to even acknowledge their existence: We're looking at you Scott Baio and Erin Moran.

To "honor" these clunkers, we have put together a list of the top five worst TV spin-offs of all time. Check it out and see if you agree ...

AfterMASH

No. 5: "AfterMASH"

When it comes to not knowing when to let go, the conversation should start and end with "AfterMASH," a short-lived spin-off of the long-running hit dramedy "M*A*S*H."

The show, which lasted for less than two seasons starting in 1983, saw Colonel Potter, Sergeant Klinger and Father Mulcahy inexplicably running a Missouri veterans' hospital following the Korean War.

The premise proved about as fresh as its title, a trying-too-hard play on words. "AfterMASH" and "aftermath." Get it?

Although the show's first season scored decent ratings, the second season was nothing less than a disaster. Of course, a schedule change that slotted the sophomore season against "The A-Team" and Mr. T's Mohawk didn't exactly help.

But the real problem was the spin-off took three of the original's least interesting characters and put them in uninteresting surroundings. If you're doing the math at home, that would be: Boring + boring = failure.

What could be worse than that? Let's find out ...

Baywatch Nights cast

No. 4: "Baywatch Nights"

If you ever wondered what David Hasselhoff's "Baywatch" lifeguard Mitch Buchannon did with his free time once the sun set, well, you're to blame for "Baywatch Nights."

The 1995 spin-off of the wildly successful syndicated original saw Mitch moonlighting as a detective alongside his cop buddy ("Baywatch" regular Gregory Alan Williams). But besides introducing the world to Angie Harmon, who would go on to star in the original "Law & Order," the show offered nothing worth seeing.

After all, the original succeeded thanks to attractive women -- particularly Pamela Anderson -- in swimsuits. But once you leave the beach and the sun behind, there just aren't many bikinis to be found.

Things only got worse during the show's second-and-final season. Seeking to piggyback on the success of "The X-Files," the show went paranormal. Unfortunately, even fewer people wanted to see lifeguard extraordinaire Mitch take on demons and vampires than wanted to see Hasselhoff "act."

If you think that's scary, you haven't seen anything yet ...

The Tortellis on Cheers

No. 3: "The Tortellis"

Carla Tortelli was one of "Cheers" least likeable characters. Sure, she was funny. But she was also sadistic, loud and, at times, infuriating.

So what would make TV producers think that having a whole family of Carla Tortelli clones running around could possibly be a hit?