The Twins – Their ice cream truck mode was basically them scanning a front/rear end and being taped together, but it was an interesting design to see. Optimus Prime + Jetfire – This was awesome. Jetfire gives his life and parts to Optimus to make into a jetpack and cannon. Megatron – Technically he got the same treatment as Optimus, with having other Transformers’ components attached to him (though with better medical care thanks to Scalpel). But he came out with an awesome design that surpassed his jet from the first film. Devastator – The only real problem with this monster of Decepticon/ILM engineering is his very unnecessary wrecking balls. Take that away and he is a titanic beast of destruction with his gorilla-like posture and his vortex grinder. For me it’s a tie between, well, all of them. ROTF had some fantastic concepts and designs.