Ted McGinley and Inna Brayer by Chris Chavira/ABC
When Happy Days and Married With Children alum Ted McGinley joined Dancing With the Stars, fans of JumptheShark.com wondered if there was blood in the water.

McGinley is the "patron saint" of JumptheShark.com, TVGuide.com's sister site where we debate the moments when good TV shows go bad. Like the moment Fonzie strapped on water skis to, well, you know.

We've asked Jump the Shark founder Jon Hein to explain what McGinley's casting may say about the future of Dancing. Here's what he said.

When my inbox is flooded in a matter of seconds, one of these three things has happened.

1. A cult series has been renewed or cancelled.

2. A major character on a popular show has been killed off.

3. Ted McGinley has been cast once again.

After seeing this fall's Dancing with the Stars lineup, I have number three to thank for all that e-mail.

Let's start by saying that you must respect Ted. In spite of his track record as the patron saint of shark-jumping, he continues to get acting gigs, and thank god for that.

The Dancing with the Stars folks are fully aware of Ted's checkered past, so why take a chance on the guy? It's simple: ABC has gotten a bit cocky, but with good reason.

This is the show that has made ballroom dancing with quasi-celebrities popular, and we're talking "take a chunk out of American Idol ratings" popular. Tom Bergeron is the consummate host who laughs with us, not at us. Second careers and sold-out dancing tours are a sure thing for contestants who click with the audience.

And Dancing with the Stars has been carefully preparing for Ted. Trista Rehn? First one eliminated. Tatum O'Neal and George Hamilton? Ratings go up. Jerry Springer and champion Emmitt Smith? No problem. Heather Mills? Handled better than Sir Paul. Marie Osmond? Relaunched her career. Marlee Matlin? The hearing-impaired actress outdid Steve Guttenberg. There hasn't been a casting challenge that Bruno, Len and Carrie Anne haven't been able to handle.

Dancing with the Stars thrives on a controversial cast of characters, but this past season the ratings began to drop. This fall's lineup is already taking chances with Kim Kardashian, Cloris Leachman, Jeffrey Ross and Susan Lucci. But the gutsy move is inviting Ted on to the dance floor with Inna Brayer.

Ted will be charming. He'll be able to dance. His smile will shine. And it all won't matter.

Good luck, Ted. It's always great to see you. The shark anxiously awaits. - Jon Hein

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