I know Fortress Maximus is a Headmaster and Metroplex isn't. I know Metroplex can interact with the base modes of the Scramble City leaders and I don't think Fortress Maximus can. Unlike Trypticon and Scorponok who are obviously very different from each other being that one is a T-Rex that transforms into a City and the other is a Scorpion with an actual robot mode. Their Autobot counterparts however are both robots who transform into cities. This kinda came up recently because I was telling my dad who's a Trekie about the Star Trek Transformers crossover and it just dawned on me that I don't actually know who this is. That head design looks like Fortress Maximus to me but he's fighting Trypticon which makes me think is that Fort Max or is that actually Metroplex? Metroplex and Trypticon are Scramble City toys while Fort Max and Scorpinok are the giant Headmasters. I don't think it helps that even the fiction seems to confuse the two some times. I mean that's probably why we have Fort Max vs. Trypticon here because they're both giant Cityformers even though that really should have been Metroplex. Though I do like the idea of using the Headmaster to transform the Enterprise. And to that respect they should of had Scorponok turn into one these. I'm kind of imaging a triple changer here where this can turn into a robot or a scorpion. And the shape of the ship already kinda looks like a scorpion. Just open the nassels and extend them outward to become the claws, bend the neck up and fold out a hidden stinger in the bridge section to become the tail. That thing on top of the main body could easily act as a panel to conceal the scorpion head and the legs could be tucked away underneath. I don't know why they didn't have this as Scorponok to fight Fort Max instead of regular old Trypticon.