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 Theories in science fiction, Parallel universes resolution 

I think that the parallel universes resolution should not be put under the science fiction catagory. There are current physics theories that suggest, at least at a mathematical level, the possibility of parallel universes. One such theory is Stringtheory. http://en.wikipedia.org/wiki/String_theory

More accuretly it is M-theory.
""M-theory
A multiverse of a somewhat different kind has been envisaged within the 11-dimensional extension of string theory known as M-theory. In M-theory our universe and others are created by collisions between membranes in an 11-dimensional space. Unlike the universes in the ""quantum multiverse"", these universes can have completely different laws of physics—anything may be possible.""
http://en.wikipedia.org/wiki/Multiverse_%28science%29#M-theory

This is also talked about in a PBS Nova special entitled: The Elegant Universe.
http://www.pbs.org/wgbh/nova/elegant/
And those videos are full of scientists and professors from various established scientific communities."