Actually,from what i know of the episodes and Innovation's Quantum Leap comic,what Sam does (in Hero System terms) is a combination of Extra-Dimensional Movement (Time Travel) and Linked Shapeshift.He just shifts times and places with somebody within his own lifetime,and shapeshifts to look like that person.
So Doug would just appear in the Waiting Room...(I think that's what it's called) looking like Sam Beckett..."There's only one kind of monster that uses bullets"-Colonel VanHeusen , from "It! The Terror From Beyond Space"
So Doug would just appear in the Waiting Room...(I think that's what it's called) looking like Sam Beckett..."There's only one kind of monster that uses bullets"-Colonel VanHeusen , from "It! The Terror From Beyond Space"