Chuck's Reviews Transformers Robots In Disguise Combiner Force One-Step Optimus Prime
 

Surprisingly, Optimus Prime hasn't had that many appearances in the RID One-Step line. This version from the Combiner Force sub-line actually mimics the Warrior Class transformation somewhat, with the cab becoming the arms. Like all One-Step changers, Prime makes for a fun desk toy and is worth a purchase.

Chuck's Reviews Transformers Robots In Disguise Combiner Force One-Step Optimus Prime - YouTube