When I got back into collecting Transformers roughly half a year ago, one of the first things I did was try to purchase replacement parts for several of the Generation 1 toys I'd really messed up as a kid. First and foremost among them: the big guy himself, Optimus Prime. Little did I suspect the insanity that awaited me on my journey to that wonderful place called Variant Hell... >_<; To spare others the frustration that I encountered, what follows here is a basic guide to telling what collectors refer to as the "Bloated Fist" Optimus Prime apart from your garden variety version. While I can't claim credit for much of what I'm about to list here - I'd say at least half of this information is cribbed from Fred's Workshop - I did spend days adding new information and taking pictures to better illustrate the differences between the two. Disclaimer 1: While I'm going to make reference to a "Standard" Optimus Prime in this thread (specifically the one that came with a dark blue Roller and Combat Deck with black missile) this is arguably just the most widespread, commonly seen one and not the only other variant out there. Also, I don't consider myself much of a Transformers expert - I've just had painful experiences with this particular case - so feel free to correct me if need be. Disclaimer 2: Forum member Notorious BIC has added: This is a good point. I freely admit that this guide is severely limited by financial feasability and practicality. Using Fred's information to lay the groundwork, I did cross comparisons between a couple of Standard Optimus Prime units and about three or four different Bloated Fist Optimus Prime units. This may not sound like a lot, but considering how casual collectors freely mix and match parts between Optimus Prime variants, it was the best I could do considering that, of the four Bloated Fist variants, I definitely knew that all of them had either never had replacement parts added to them or had been under the watchful eye of a collector who knew what he was doing. This is also why I've neglected comparing the gas pump assembly hoses between Primes. The prices for those are insane. I was trying to keep "transitional variants" out of the picture for purposes of simplification, so consider this guide as being valid for the commonly-seen gray Roller/metal plates/bloated fists version of Optimus Prime rather than some of the more exotic specimens. Part 1: The Accessories I won't bother going into too much detail here because the differences are pretty self-evident: Bloated Fist Optimus Prime's Laser Blaster, fists, gas pump and nozzle are all larger and more detailed than Standard Optimus Prime's. (This is, in fact, where the nickname for this variant comes from.) Bloated Fist Optimus' fists have thumbs that point forward. The thumbs on Standard Optimus' fists point downwards. Bloated Fist Optimus' gray rockets have two rings halfway down their shafts rather than just the one seen in Standard Optimus' black rockets. Bloated Fist Optimus' Roller is gray instead of dark blue.