Robosen Robotics' Optimus Prime robot can automatically transform into a truck just like the movie/cartoon versions, but the breathtaking $900 price makes it more a toy for collectors than children. Now, Hasbro and Robosen have launched a companion Trailer and Roller set for Optimus Prime with equally cool auto-conversion features and an equally steep $750 price. Based on the G1 design, the trailer measures an impressive three feet (1 meter) in length, fully extended. Using Robosen's clever robotics, it automatically unfolds and tilts vertically into a nearly flat rectangular shield, complete with an integrated, articulating sentry blaster. In truck mode, it houses the Roller vehicle and human sidekick Spike "who is ready to jump into action or enjoy the ride." The blaster can also be mounted for "further firepower and support," according to Robosen.