Rolling Thunder Optimus Prime.
This one is tied with Dominator Megatron for the second most painful loss, because I had about a minute of a fight scene fully animated and voiced with some of the sound effects mixed in. Live and learn, I guess.
The model is based off of some sketches by Don Figueroa of a failed GI*Joe/Transformers crossover story line. Stupid Hasbro.

Trailer open.

Trailer closed.

I don't care if it looks like he's bustin' a move - Don Figueroa's sketches make
kick ass models.