The Munchausen's Wheel is a dangerous device used to transport people from pocket dimensions to the physical plane.
The Munchausen's Wheel is a giant wheel designed to bring a person trapped in a pocket dimension back to the physical plane. It requires several people to turn the wheel and provide it enough energy. However, it is highly unstable and it worked only three times. It was successfully utilized a fourth time by Morgan Le Fay, who was banished by the Merlin. Ray Stantz and Rachel Unglighter immediately recognized it on sight but the team was too late and Le Fay arrived.