Strange things continue happening in Crystal Cove, when doorknobs suddenly vanish and a priceless diamond is hidden somewhere. To top it all off, a mysterious Ghost Trucker is also scaring the town.

A Man Crab attacks Crystal Cove beach during a volleyball tournament for Trickell's Triquid diet mixture. The gang must stop him and solve this mystery before the tournament's female players, who the Man Crab has taken a liking to, are put in danger. Meanwhile, Velma gets some relationship advice from Daphne.

The gang attends the Royal Knights Faire in Crystal Cove, but so does an unexpected guest. A scary-looking gnome is paralyzing everyone wearing pirate costumes at the faire.

Feeling left out of the group, Velma goes solo to investigate attacks by amphibious "Fish Freaks" in the area around an abandoned oil rig, only to find a friend of her own... in the form of a mermaid!

Deep-sea robots attack Cassidy. The gang helps her solve the case of who is sending them.

The gang investigates Sheriff Stone's alien abduction claims while real aliens are stealing valuables from Crystal Cove.

A deceased ska band returns from the grave and hypnotizes partygoers at the local nightclub to dance to their music. The gang is called to solve the mystery before they dance themselves to death.

The heroes must work together to realize that their love for each other is the true Heart of the Jaguar.