I'm not that keen on the futuristic sci-fi ones......I'm into the going back in time to try and change things type of stuff.
Though it pisses me off that the Yanks always have to have them based on stopping the JFK assassination. There's plenty of other bad shit they could try and stop.
And what about a Brit one going back in time to stop the Farage and Bozos? And obviously Thatch as well. Throw Savile in too!
Life on Mars and Ashes to Ashes were great examples of how to do it, but the all time greatest has to be the original of "The Time Machine" with Rod Taylor from 1960.
I saw that as a young kid and I was hooked on time travel from thereon. Not interested in any other sci-fi.