Time travel in movies always throws up big questions. Could you interfere with your own history? Do parallel universes exist? Is a DeLorean really the best car to build a time machine out of? Frankly, they are mysteries that could blow the average human mind, so Total Film has tracked down someone who really knows what he’s talking about to find out which movies get the science right - and wrong.
Professor Jim Al-Khalili is a top theoretical physicist, as well as being the host of BBC Radio 4’s The Life Scientific, and many a science documentary on BBC Four. He’s also watched plenty of time-travel films.