Just like “jumping the shark” derives from an episode of Happy Days that most people probably have never even glimpsed, the ...

The genius of “Doctor Who” is that it takes all of the best sci-fi tropes – time-travel, aliens, technology and the vast, unknowable aspects of space – and compresses it into one person.

One of the most popular science fiction tropes in movies and TV, right up there with time travel and extraterrestrial life, is the idea of parallel universes or alternate universes. The concept of ...