Instead of a wheelchair-bound super mutant and his mutant-hating father, the villains in an early draft of X2 would have been the deadly Sentinels. However, as io9 points out, the money wasn’t yet there to animate a bunch of 50-foot-tall mechs in 2003, and Fox shelved the idea for the script we ultimately saw. We’d have to wait another three years to see the Sentinels on the big-screen in a short Danger Room sequence in 2006’s X-Men: The Last Stand.

But there are still concepts from that period, developed by production designer Guy Hendrix Dyas and concept artist Ricardo Delgado during the pre-production period leading up to the release.

Looking at these offers a night-and-day contrast with the sleek designs used in Days of Future Past, emphasizing weight and force over movement. Seriously, these things look like they’re made out of seven tons of anvils and probably move half as fast. They also look incredibly deadly when compared to their 2014 counterparts.

Dyas and Delgado’s designs likely took their inspiration from a more brutal style of industrial design (with a little bit of the Terminator thrown in). I could easily see one of these guys popping one of the X-Men’s heads off. Unsurprisingly, the early 00’s production was light on color for its designs, and I suspect if they did make it to the screen, these bad boys wouldn’t have been the iconic multi-tone purple we all know and love.

Click below to embiggen the designs. Embiggen, I say!