Scooby and the Mummy's Maniacal caper

Scooby and the gang head off for a road trip. Unknown to them they were in for a ride.

It was around midnight at the Barloff Museum. The administrator was locking up for the night when he heard glass shatter. He turned and saw an ancient mummy's tomb had green gas coming out of it. He walked over there and was pulled into the tomb as someone walked out.