: The museum curator, Mr. Wickles, explains a legend stating that the Black Knight armor comes to life whenever the moon is full. The Investigation

The episode begins with Shaggy and Scooby-Doo walking home from the movies when they discover a deserted pickup truck containing a suit of black armor. After reuniting with Fred, Daphne, and Velma, they return the armor to the County Museum. They soon learn of two major issues:

: Professor Jameson Hyde-White, a renowned archaeologist, has vanished.

The gang searches the museum for clues, facing the terrifying Black Knight in several chases. Key findings include: