Watch Scooby-Doo

After solving the case of the Luna Ghost, an unco-operative Mystery Inc., consisting of Fred, Velma, Daphne, Shaggy and Scooby-Doo, splits apart. After 1 year, Velma has been an advisor at NASA, Fred has become a popular celebrity, Daphne has become a skilled martial artist, and Shaggy and Scooby have stopped investigating mysteries. Two years later, the gang is surprisingly reunited when they are all summoned to Spooky Island, a monster-based theme park on a remote island. While Shaggy and Scooby wish to work together as team, the others are not as enthusiastic. On the plane ride there, Shaggy falls in love with a girl named Mary Jane, who likes Scooby Snacks and is allergic to dogs. On Spooky Island, the gang meet Emile Mondavarious, the eccentric owner of the island. He explains that visitors to the island come but leave as emotionless and almost inhuman (as demonstrated when a girl picks up an older man and throws him away with one arm).
Since they are still upset with each other, none of the former Mystery Inc. members want the others to solve the mystery first, so they all split up to search for clues. Velma witnesses a creepy dance in which a man named N'Goo Tauna and his servant, Zarkos (A.K.A. The Masked Luchador wrestler) explain that demons once ruled the island until Mondavarious built the theme park on it, enraging the demons. Velma is unafraid of N'Goo's threats of vengeance. Daphne meets Voodoo Maestro who quite clearly warns her not to go the Spooky Island Castle attraction, but she believes he is setting a trap for her there and goes to spring the trap. The gang meet up at the castle and split up to search for clues as group. Fred and Velma discover a strange classroom with a training program describing how to act like a human. Daphne finds a strange triangular artifact called the Daemonritus. Then after Scooby belches quite loudly, he and Shaggy then get into an exaggerated belching contest that then turns into a farting contest where both do both quite loudly and with exaggerated mannerisms (and Scooby reacts to the smell). Moments later, Shaggy farts again and it echoes in the suit of armor he's wearing, while the gas briefly ignites over an open flame.
The group escape the castle when an alarm is triggered by a hidden minion of N'Goo. The island demons attack the hotel, capturing Fred, Velma, Mondavarious and many other guests. Shaggy, Scooby, Daphne and Mary Jane are the only ones to escape. The next day, everything seems normal and the hotel is clean and tidy. Shaggy and Scooby locate Fred but discover he and all the other guests are being controlled by the demons. Daphne is captured by Zarkos and loses the Daemonritus. Shaggy and Scooby find Mary Jane and they escape from the demons on quadbikes, Scooby discovering Mary Jane is also controlled. Scooby falls down a hole, Shaggy following, but he discovers a pool of ectoplasmic heads. He releases Velma, Daphne and Fred, who return to their bodies, exposing the demons to sunlight and destroying them. However, Fred and Daphne get caught in each other's bodies. When Fred is in Daphne's body he first looks down her shirt and looks at her breasts, possibly confirming the relationship between the two. Eventually though, they get to their original bodies when Shaggy brings the Daemonritus to the group, the unstable ectoplasm reacting to the presence of the artefact and causing all four members of Mystery Inc. to switch bodies randomly until they are back in 'alignment'.
The four find Voodoo Maestro trying to perform a protective ritual, where he explains that if the demons sacrifice a purely good soul to the Daemonritus- using the ectoplasm as an energy source for the ritual-, they could rule the Earth for 10,000 years. The purely good soul belongs to Scooby-Doo, which causes the group to realise that the mastermind behind this plot must be Mondavarious as he is the whole reason Scooby is even present (Although the mystery of why he invited the rest of the group remains). Although the others doubt their ability to pull off a victory over actual demons- as opposed to their usual area of expertise consisting of 'nutjobs in Halloween costumes'-, Shaggy rallies them all by stating that he will never abandon his friend and reminding them of their old status as heroes, encouraging the rest of the group to help him.
The gang form a trap to destroy the monsters, planning to open the island's main ventilation system to spray sunlight over the demons- aided by a 'glitter skull' to spread out the sunlight-, after tipping over the ectoplasmic vat to force the demons out of their bodies. However, Mondovarious and N'Goo enter with all the possessed guests, beginning the ritual to sacrifice Scooby. Fred and Velma are captured as the ritual begins, but Daphne and Shaggy manage to escape, Daphne retreating to the area above the cavern while Shaggy disguises himself to try and rescue Scooby. As the ritual begins, Mondovarious absorbs the ectoplasm via the Daemonritus, but Shaggy, Fred and Velma are able to interrupt the ritual before he can absorb Scooby, Shaggy injuring Mondovarious in the process. As Daphne fights Zarkos on top of the island, Fred and Velma discover that Mondovarious is a robot, controlled by none other than Scrappy-Doo, who seeks revenge after being thrown out of the gang, having invited the rest of the group to witness his triumph. Due to his large absorption of energy, Scrappy transforms into a monstrous demonic dog and tries to kill Scooby. Daphne manages to kick Zarkos through the ventilation system, destroying the demons with sunlight, saving all the guests including Mary Jane. Shaggy manages to remove the Daemonritus from Scrappy, transforming Scrappy back to his normal self. Scrappy still tries to fight, but an exasperated Scooby just knocks him into a wall with a flick of his paw, knocking him out.
Fred and Daphne kiss as a victory, while Shaggy finds the real Mondavarious who explains that he was trapped in a hole by Scrappy. Scrappy, N'Goo, Zarkos and the other minions are arrested, and Mystery Inc., now completely back together again as a more equal team- particularly reflected when the formerly arrogant Fred allows Velma to explain their line of reasoning for the news teams-, head off for their next case. In the final scene, Spooky Island seems to be back to business with Scooby and Shaggy enjoying the "all you can eat" that was promised to them when they were invited to the island.

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Scooby-Doo is a 2002 mystery with a runtime of 1 hour and 26 minutes. It has received mostly poor reviews from critics and viewers, who have given it an IMDb score of 5.3 and a MetaScore of 35.