The story takes place in a parallel dimension, where prehistoric life thrives alongside diverse human civilizations that are not technologically advanced.

A group of 19th-century scientists, the SEAS (the Society of Exact Alternative Science) led by scientific genius Jarvis Babbit, discovered the parallel world where dinosaurs and primitive human tribes coexist.

When they subsequently learned that people don't age in this dimension and that the concept of electricity is inexistant, they decided to remain there to rule.

Their main goal is to return to their home world, but to do this they will need to enlist the aid of enlightened natives and battle against the hostile creatures, tribes, and ultimately the masterminds trying to stop them.

Along the way they'll meet several characters who are seemingly based on classical scientists such as Nicola Tesla or Charles Darwin ("Nikolaj Taslow" and "James Warden" in the game).

They eventually discover that a man named David Leighton, who is one of Babbit's men, is orchestrating events on the parallel world, and pursue him.

However, members of the ParaWorld gaming community "Para-Welt" have created an unofficial downloadable version of the Booster Pack for all regions that incorporates updated community content (such as modifications enabling players to utilise the previously NPC 'SEAS' factions) alongside the official SEK Booster Pack content.