Have you ever wondered how much of the technology and science used in Star Trek is even plausible? The show began in 1966, and was so popular that five other series and eleven movies came in its wake.
Here is a link to a documentary about the science behind Star Trek. It not only discussed how the movie was made but also asks the questions about the physics of warp drive and SETI's involvement in searching for life beyond Earth.
The concept of a multiverse is not uncommon in science fiction or comic books. The very idea that we exist in some other dimension as ourselves but because we went left instead of right one day, the version of ourselves could be strikingly different.
This concept is not just all comic book fantasy. There is real science to it. There are two articles below. One is a break down of the multiverse in comic books and the other is about the actual science behind it.