Scooby and Shaggy are forced to go to see a doctor after the rest of the gang were gravely concerned about their health amid the two were eating junk food all their lives. The doctor does a couple of tests on them, for example, weight check, throat check, x-ray, blood tests and pressure tests. The doctor came to the conclusion that Scooby and Shaggy have a serious overeating problem. He strongly suggests that they have to starting eating healthy food, 'cos if they don't, they'll die before they reach 40 (6 in dog years).
The next day, while on a mystery, Scooby and Shaggy are struggling with the fact that they'll no longer eat junk food. They keep freaking the hell out, trying to calm each other down, but it gets worse. Shaggy says, "Like, I can't take anymore of this! How long have we been off the junk food?!". "Just 10 minutes, guys.", says Fred. "Raaah! Rhat's rorse!" says Scooby. "Jeepers, they look like they're on the verge of suicide.", says Daphne. "YOU'RE ON THE VERGE OF SUICIDE!", says Shaggy. "AAAAAAHHHHH! OH GOD, MAKE IT STOP!", he also shouted. Scooby slaps him and says, "RALM ROWN!" Shaggy apologizes. They both agree this is the best thing to do, and decide to go on a badly-needed diet and run off. "Don't they realize we're in the middle of a mystery?", says Velma.
Scooby and Shaggy start jogging, exercising, lifting weights and mosg importantly, eating vegetables and fruit. Months later, Scooby and Shaggy become ripped. They have also become agile. Now they stop the monsters first thing they see them by beating them up and saying killer one-liners. They also take all the credit for stopping the monsters. Fred, Velma and Daphne grow envious and fight fire with fire by getting ripped too. They soon fight Scooby and Shaggy in a monsterous cringeworthy battle. Scooby and Shaggy win anyway. The gang part ways and the two start solving mysteries their own way, by using their powerful gigantic muscles to beat the hell out of villains.
SCOOBY DOOBY DOO!