While visiting Vulture's Claw Botanical Gardens, owned by one of Velma's friends, Professor Greer, the gang confronts a seven-foot-tall praying mantis that roams the grounds.

The gang go to Decade Records recording studio to watch a live recording of their friend, Jimmy Lewis. But the building is haunted by the Phantom, who is trying to find a song by a missing writer, and will stop at nothing until he gets it.

The gang travel to China making their way to the city of Rampoo. While there, the gang run into the Moon Monster, whose shadow, legend says, turns people into stone.