School is out and the familiar Scooby gang are looking to enjoy a long vacation. However, sightings of a Lake Monster cause them to band together once again to solve yet another mystery.

A submarine newly commissioned is damaged in the opening days of WW II. A captain, looking for a command insists he can get it to a dockyard and captain it. Going slowly to this site, they find a stranded group of Army nurses and must take them aboard. How bad can it get? Trying to get a primer coat on the sub, they have to mix white and red in order to have enough. When forced to flee the dock during an air attack, they find themselves with the world's only Pink submarine, still with 5 women in the tight quarters of a submarine.

Orphaned high school student Rick Riker is bitten by a radioactive dragonfly, develops super powers (except for the ability to fly), and becomes a hero.