Scooby was born at Knittingham Puppy Farm, but ended up a stray early in his life until the day when he met Shaggy Rogers at the beach while he was on the run. Shaggy took the puppy in and they became the best of friends from that day forward. On their first Halloween together, a duo of bullies stole their Halloween candy and threw it into a house that was rumored to be haunted by a ghost. Shaggy and Scooby met Velma Dinkley, Fred Jones, and Daphne Blake, and together they revealed the ghost to be the house's owner Mr. Rigby and uncovered his operation of stealing electronics. The five immediately became the best of friends and formed Mystery Incorporated on that night, solving supernatural mysteries as a team up into their teenage years.
Scooby and Shaggy were ejected from the team by their investor and spent time together alone when they were attacked at a bowling alley by robotic scorpions known as the Rottens. Eventually, the two were rescued by the superhero trio Blue Falcon, Dynomutt, and Dee Dee Sykes, who revealed that the one behind the attack was supervillain Dick Dastardly, who was searching for the skulls of Cerberus, the three-headed dog of Greek mythology. Dee Dee informed them that Dastardly had found one of the skulls and was after the other two, and he was already pursuing them.
Dastardly chased the group to an abandoned amusement park, only for the heroes to escape. Unfortunately, time was running out as Dastardly had found the second skull and the last one was guarded by Captain Caveman, who challenged Blue Falcon to a fighting match for it. Falcon was easily bested as was Scooby, but Fred, Velma, and Daphne arrived in time to save their friends.
Their rescue was short-lived as Dick Dastardly arrived and retrieved the third skull, taking Scooby captive in the process. Scooby was then taken to Greece, where the gang learned that Dastardly was trying to reunite with his dog Muttley, who had been trapped in the Underworld when the two had sought a trove of treasure that belonged to Alexander the Great, who conquered Greece in the 4th Century. Dastardly also revealed that Scooby was the last living descendant of Peritas, Alexander's beloved dog, and therefore Scooby alone could open the gate. Scooby did so under pressure, allowing Dastardly to reunite with Muttley and steal some of the treasure. Unfortunately, Cerberus was revived and a battle ensued to stop him.
Velma deduced that the gate could be sealed again and locked if two friends did so together, but at a terrible price: one of them, dog or owner, had to lock the gate from within the Underworld. With the help of Blue Falcon and the others along with some help from the reformed Rottens aiding Scooby and Shaggy, Cerberus was returned to the Underworld, but Shaggy gave himself to seal the gate. Scooby grieved for his friend, but was overjoyed when Cerberus let Shaggy leave the Underworld as only the dead belonged there. Thus, Scooby and Shaggy were reunited and they continued to solve mysteries with their friends as they always had.
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