Tomb of Valdronya

Vincent Van Helsing's vampire museum had a set of glass-faced coffin on display, which appeared to contain a body.

Scooby-Doo! Music of the Vampire
Van Helsing said it was the body of Lord Valdronya, a centuries old vampire. Shaggy Rogers and Scooby-Doo saw the eyes of the figure glow. Later the gang found the tomb empty after Valdroya was supposedly resurrected, even though the coffin was still tightly sealed. It turned out the body was a holographic image, projected to look like it was behind the glass.

Appearances

 * Scooby-Doo! Music of the Vampire

Notes/trivia

 * It is not revealed how Van Helsing made the eyes glow when only Shaggy and Scooby were looking. Probably he had a remote control in his pocket.