You will Watch Scooby Doo! Mystery Incorporated Episode 3 online for free episodes with HQ / high quality. Stream cartoons Scooby Doo! Mystery Incorporated 103 Secret of the Ghost Rig.Crystal Cove is being terrorized by a mysterious Ghost Truck that has been running people off the highways. Meanwhile, Fred is helping his dad who is running for reelection as mayor and Daphne’s parents are trying to set her up with the young heir to a ladder company. As all of this is happening, numerous crystal doorknobs are stolen from all around Crystal Cove. With the help of Mr. E. the gang solves the mystery.