The yellow and grey one which matches the voice-changer helmet, so cool!
Recoil action and electronic music, sounds and lights help bring the battle right to your living room! Add some extra punch to your battle when you convert the cannon to robot fist mode with smashing and conversion sounds that let you duke it out - just like Bumblebee!
Costs £34.99 online and £39.99 at Argos (has good reviews there)
I was surprised that it is reduced already as I expect that it will be on many Christmas lists