I recently picked up this, umm, I guess it's a miniatures "wargame" from Crooked Dice Studios. It's based on the system they designed for a Doctor Who miniatures game, but they adapted it into something they could sell without licensing, and in the process widened the scope out to cover all sorts of cheesy 60s/70s action/sci-fi/spy-fi shows.
While there is an "official" line of minis that go with the (hilarious, fictional) shows that hailed from 7TV Studios, there's a detailed system for creating your own heroes and sidekicks and "extras" to star in your own shows. They helpfully point you to all sorts of miniatures companies but of course it could easily be played with minifigs.
They also have "7th Voyage" (which is apparently a swashbuckling Harryhausen-type game) and ZombieTV (which should be pretty self explanatory) and all four games (if you include the Dr Who one) are cross-compatible because they're based on the same engine.
Worth checking out.