What a Night for a Knight

Series pilot. While walking home from the movies Shaggy and Scooby-Doo discover an ancient suit of armor called the "Black Knight" in the driver's seat of a pickup truck, and the gang delivers it to the local museum. The kids later break into the museum to search for clues, thinking that the archaeologist who was transporting the suit may be missing, and instead find that the suit of armor may be alive.