After 52 years of solving mysteries, the Scooby gang reunite at Warner Bros. Studios to reminisce about their favorite cases and how they were filmed. But it turns out that the back lot may have its OWN monster problem. Fred, Daphne, Velma, Shaggy, and Scooby-Doo investigate this mystery while celebrating the legacy of the franchise.

Alien Arsenal, also released as Alien Weapons, tells the story of two teenage misfits, Ralph and Baxter, who accidentally discover a bizarre vault full of alien weaponry and body armor in the basement of their high school, with which they harness the power to transform from super geeks...to superheroes. Unfortunately, their discovery signals the arsenal's alien owners who have returned to Earth to reclaim the deadly cache...and destroy the planet!