John Wayne on a dinosaur. I want to see that movie. It would certainly explain his gait.
So would I. It could be a lot of fun....
Why does it have to be done realistically? What, like Superman, Trek, Heroes, Stargate, Dr Who or some such. If realistic science is a yardstick for what makes good TV sci-fi, then there’s never been a good TV sci-fi show. It’s escapism, entertainment and here’s the kicker – fiction. ; )
Absolutely. it IS fiction. Yet in all of the examples you listed, each show explains in a consistent way how things work. In a way that's plausible. The only way for Space 1999 to work in a plausible way, is if space is much much smaller than we think it is.
All of the shows you listed, are VERY close to our world and they use science fiction gadgets to explain how their heroes do the things they do. Stargate: wormholes connected by gates. Doctor Who: a time machine that travels through space and time through the time vortex. Star Trek: the warp drive.
Even escapism needs to make sense in some way, or you don't get lost within it.