Run a RPG campaign going backward in time (for beginners)

Skull RPG: Game Masters Tell Your Story

Hey Storytellers,
Continuing the theme of running multiple characters in different timelines this concept is a little easier to pull off. Your campaign can have three acts but each act is a different set of characters in a different timeline.
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I ran a campaign that utilized some interesting concepts from either The Black Tapes Podcast (http://theblacktapespodcast.com/) or Tanis (http://tanispodcast.com/) both are worth the listen though I liked The Black Tapes better.
The campaign I ran was about a demon that was being summoned in modern times and my players played a group of investigators.
Then in the next act we went back to ancient Greece and the demon was running rampant on the planet during this time, but the players sealed it away for their first characters to keep it sealed.
Then the third act would take them back to prehistory where they would be responsible for unleashing the demon into the world in the first place.
Listen to the episode for more ideas.