Scooby-Doo! Curse of the Lake Monster.School has just ended for the summer, and Velma (Hayley Kiyoko), Shaggy (Nick Palatas), and Scooby-Doo (Frank Welker) meet up with Fred (Robbie Amell) and Daphne (Kate Melton) so they can go to meet Daphne's uncle, Thornton "Thorny" Blake V, who has given them summer jobs at his country club in Erie Point. That night at the club's opening party, a huge frog-like monster suddenly appears and wreaks havoc. The gang decides to solve the mystery. They decide to investigate the only person who has ever taken a picture of the lake monster, Mr. Uggins, the lighthouse keeper. He then tells them the story of the lake monster: how when people were first settling Erie Point, an old woman named Wanda Grubwort warned them not to come onto her land. They paid no attention to her, so she used her magic staff - which used moonstones as the source of her power - to turn a frog into a horrible monster that attacked the villagers. Wanda was later tried for witchery and burnt at the stake. The next day, Velma shows the others security footage of the lake monster meeting a mysteriously masked figure on the beach. They begin to zoom in on the figure to see its face, but Velma accidentally spills her green tea on the computer and destroys the footage. The next morning, they find Velma unconscious on the beach. Shaggy begins to tell her that he was very worried, but stops when he notices warts on her hand. Velma looks surprised, but guiltily assures them that it's nothing. After they fill her in on the latest monster attack, Daphne says that she saw purple paint on the figure's cloak, and suggests they check out a boat that they saw on the way to Erie Point...