It's not M&M, but would this be of interest? <a href="https://app.roll20.net/lfg/listing/10987/dark-rift" rel="nofollow">https://app.roll20.net/lfg/listing/10987/dark-rift</a>... The basic premises to the setting is that in 2300 the Leylines around the world become active bringing magic into the world and spawning inter - dimensional Rifts which transport dinosaurs, elves, aliens and more onto the planet. Over 90% of the human population was wiped out in under a year.
