Backstory: As the new Twisters journeyed through time, they encountered this man, who claims to have no name other than "R", who after a brief discussion decided to join their group. He has been sent on countless missions and has a 100% success rate due to his being a ruthless warrior.
The vehicle is known as the "Time Warp Cage" - a cage which allows for deployment of odd creatures, such as this so-called "Rock Monster". It also has a large gun because it would be pretty boring if it was just a cage. The cage has little mobility and is mainly useful when accompanied by a transport unit.