Crash these figures together in one awesome step to form a primestrong combiner robot the optimus prime figure converts from robot to truck in 3 steps strongarm figure converts from robot to police car in 3 scan the autobot shield in combiner mode to unlock the primestrong character in the mobile app crash combiner primestrong figure optimus prime and strongarm figures combine to form primestrong figure crash and combine figures in 1 awesome instant step works with other crash combin