The gang must stop a shape-shifting alien before NASA's shuttle mission is aborted.

The gang goes to Las Vegas to meet teen pop singer Lindsay Pagano, but they soon end up trying to uncover the mystery of a deceased magician who's haunting the theater that Lindsay's performing at.

The gang goes to Banning Junction to visit Velma's family for Halloween, but they meet the ghostly robots who try to ruin the festivities. Hopefully they can save the town before the ghost of Hank Banning shows up.