Multiversal USA

Reborn in the 30s Arthur Pendragon uses is gifted abilities to end WW2 with advanced technology. But with the war over a discovery is made, Nazis cracked dimensional travel and poked hole in the Fabric of reality. Now, portal are opening all over the world allowing everything from Dinosaurs to Roman Legonaries on to Earth. Wose the portals can open to fictional world like Wolfenstein, now with orders from the president our Genius inventor must protect the Sarth from what comes through the portals. Can he save the Earth from Other realities or will the Soviets using kidnapped Nazi scientists destroy the Earth themselves.