Scooby-Doo! Curse of the Lake Monster

As summer vacation begins, the group travels to Erie Point to take up summer jobs at Thorny Blake V's country club. The aim is to help cover the costs of their previous mystery. They settle into the club environment and prepare for the opening season.

During the club's opening party, a frog monster bursts onto the scene and attacks guests. The group bands together to defend attendees and start investigating the source of the creature. The incident sets a supernatural tone for the summer.

The group interrogates Elmer Uggins, the lighthouse keeper, who is the only one with a photo of the lake monster. He shares the tale of Wanda Grubwort, a witch who drew power from moonstones and warned settlers to stay out of her territory. His account links the monster to a long-lost magical history.

Uggins recounts Wanda's execution by burning and explains how her magic staff could transform a frog into a monster. The backstory connects the present threat to Wanda's power and moonstones. The group begins to see the legends as having real, dangerous influence.

Velma shares security footage showing the lake monster encountering a cloaked figure on the beach the next day. The team tries to analyze the face, but Velma accidentally destroys the video by spilling green tea on the computer. The mystery deepens as crucial evidence is lost.

Friction grows between Fred and Daphne, straining their teamwork. Meanwhile Shaggy's uncertain feelings for Velma complicate Scooby's bond with him, causing alienation. The personal drama threatens to derail their investigation.

The group wakes to find Velma unconscious on the beach the next morning. Shaggy notes warts on her hand, a clue that hints at possession, though Velma dismisses it as superstition. The mystery deepens as strange symptoms appear.

Daphne reports purple paint on the cloaked figure's cloak, suggesting a link to a boat spotted en route to Erie Point. The team decides to investigate the boat for more clues. Their plan shifts toward identifying the figure behind the attacks.

Velma agrees to go on a date with Shaggy, hoping for a normal evening. The moment becomes tense when candles are lit and a mood of unease settles in. Scooby's interference adds to the awkwardness of the date.

Fred and Daphne are locked in a room that begins to flood as they hurry to join the others at the boat. They manage to escape the rising water and regroup with the rest of the team. The near-death moment strengthens their resolve to solve the case.

The team visits Hilda Trowburg, a descendant of Wanda, and sees Velma through the windows, where she attacks and renders them unconscious. Hilda explains Velma has been possessed by Wanda's spirit. The group realizes their internal conflicts masked the warning signs.

They follow Velma to underwater caverns where Wanda, controlling Velma, uses her staff to turn three frogs into monsters that attack them. The team fights to resist Wanda's control and save Velma. The confrontation reveals the true danger behind the moonstones.

Shaggy tries to reach Velma by singing her favorite song as the monsters close in. Velma is able to break free from Wanda's hold and returns to herself. The emotional moment marks a turning point in the crisis.

Scooby confronts Wanda and destroys her magical staff, killing the witch and restoring the lake monsters to their normal forms. The danger ends as Wanda's power collapses. The team breathes a collective sigh of relief.

Velma and Shaggy confess they have no romantic feelings and decide to stay friends, allowing Shaggy to reconcile with Scooby. The air clears and strengthens their bond as a team. Thornton Blake V thanks them and promises to secure legal help, and Daphne officially names the group Mystery Inc.