It's not my Scooby-Doo.

Please don't think that means I'm resistant to change, or that my Scooby-Doo mindset is stuck in the cartoons from the 1960s and '70s. To be honest, I quite enjoyed the live-action Scooby movies from 2002 and 2004, which did a pretty good job of bringing the campy cartoons to life even though they were very, very different in tone. And, although I have by no means kept up with the many incarnations of Mystery Inc. over the years, I have enjoyed sharing Scooby and the gang from various eras with my kids.

They were understandably excited to see Scoob! as soon as it came out, so my wife dutifully bought the streaming copy assuming they would watch it over and over again. It wasn't too long before they were fidgeting, however, and it was pretty obvious they were bored.

It's one thing to update the Scooby gang for a modern audience. This totally changes the formula, however -- so, instead of wacky hijinks as the gang investigates a faux ghost or monster, they're suddenly mixed up with superheroes and alternate dimensions, partnering with Blue Falcon and Dynomutt while battling with other Hanna-Barbera characters like Dick Dastardly and Captain Caveman.

Apparently, Scooby-Doo is now the last descendant of Alexander the Great's dog Peritas, and so he's the key to opening the gates of Hades and releasing the giant three-headed ghost dog, Cerberus.

There are a few jokes deserving a laugh, but not many. Some of the voice work is OK, but Will Forte's Shaggy -- arguably the most important character, after the dog -- doesn't sound like Shaggy at all. Some of the jokes were a little too unsubtly adult for my taste, too -- dropping "f-bombs" and "just falcon around" -- considering the target audience is small children.

More importantly, the story is way too cosmic for a Scooby yarn. These are supposed to be young adults unmasking cranky old coots with a ghost fetish, not crossing dimensional rifts and fighting actual mythical creatures.

Most telling of all, though -- in the couple of weeks since we watched the film, the kids have watched plenty of Scooby-Doo cartoons on TV. But they've never asked to see Scoob! again, even though they know we bought the damn thing and can watch it whenever they want.

That's disappointing.

Besides Forte as Shaggy, Scoob! stars Zac Efron as Fred, Amanda Seyfried as Daphne, Gina Rodriguez as Velma, Mark Wahlberg as the Blue Falcon, Jason Isaacs as Dick Dastardly and Ken Jeong as Dynomutt.