Fallout co-creator Tim Cain once proposed a first-person time-travel RPG where you could assassinate historical figures and create paradoxes

Fallout co-creator and prolific RPG programmer Tim Cain’s YouTube channel is a treasure trove of what-if stories. What if WildStar had shown up to the MMO craze just a few years earlier? What if Interplay made Fallout 3 instead of Bethesda? What if THAC0 wasn’t so egregiously confusing that Cain’s encyclopedic knowledge of it didn’t get him hired at Interplay in the first place? They’re all worth the watch if you fancy yourself an RPG gamedev loremaster—but yesterday, Cain talked about one of his wildest what-ifs yet.

In his most recent video, Cain discussed Time Walker—a proposal for a first-person RPG he drafted at Troika with fellow RPG veteran Jason Anderson, who worked with him on games like Fallout and Vampire: The Masquerade – Bloodlines. While the game never came to be, even in the form of a prototype or more elaborate pitch, it sounds ludicrously ambitious even today.

In Time Walker, you’d play a “temporal agent” traveling through time and completing missions to ensure your own reality’s existence as enemy agents try to rewrite history. As the timeline becomes less and less stable, your gear becomes “more fantastic and improbable,” but mess things up too much and your reality poofs out of existence. Once you guarantee the existence of your reality, you beat the game, but if your reality ever becomes impossible, you “cease to exist.” Horrifying!

“Feature bullets, these are great,” Cain laughed in the video. “One, visit 15 different time periods. Two, meet interesting historical figures. Three, kill them.” Some example missions he mentioned involved assassinating a pharaoh in ancient Egypt, giving a young girl a specific doll on her eighth birthday (presumably as part of some shenanigans involving the butterfly effect), and creating a paradox by preventing the invention of time travel.

The way your timeline’s likelihood of existence would balance gameplay was meant to invert the typical progression curve you find in many RPGs—instead of the game getting easier as you level up and snag powerful items, the game would get easier as time unraveled and you got to play with anachronistic technology. Once you restored order and got closer to guaranteeing your own reality’s existence, you’d be back to a more standard FPS loadout.

Cain also mentioned the game would have made it to the Xbox, incorporated online multiplayer, and had an open-ended skill tree offering multiple solutions to each mission like the CRPGs he’d worked on before this. I still get surprised by the strange and novel ways in which you can beat Fallout, so thinking about the different routes you’d have to account for by throwing in time travel through 15 different zones makes my head spin.

It’s worth noting that Jason Anderson, who concocted this pitch with Cain, is currently working at InXile as principal designer on Clockwork Revolution—a first-person time-traveling RPG where reality morphs in accordance with your meddling. It’s hard to say how much of Time Walker ended up in that game since it was only ever just a proposal, but it’s a fun parallel.