While it might be best not to hold your breath for a fourth Back To The Future movie, Christopher Lloyd – aka Emmett Lathrop 'Doc' Brown, Ph.D – is ready for the call, should it ever arrive.
And he's got a good idea of what it should be about too, and while illegal betting practices and appropriating Chuck Berry riffs were all well and good, if there's a new adventure for Marty and Doc, it should have a bit more of a message.
He told Comicbook.com: “I think somehow it needs to kind of convey a message about something that’s important to everyone, universally, like climate change.
“Some way of incorporating whatever fever is going on at the moment into the film and keep the feeling of one, two and three.
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“That’s a tricky, tricky deal. Because you don’t want to do another one and disappoint. So I don’t know. I’d be happy to, for myself. But we’ll see.”
He also added that he'd be 'happy' to reprise the role, should it come around again, before speaking about co-star Michael J. Fox.
His Parkinson’s, he has it, but it’s kind of, ‘So what?’ He just moves ahead. It’s very cool,” Lloyd went on.
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“A couple months ago there was like a bunch of us, Back to the Future [cast], Tom Wilson and Lea Thompson... we had a panel with all of us, and Michael just goes forth and talks, breaks people up, so it’s very cool.”
Lloyd has long said that he'd be up for a fourth movie, telling the Phoenix New Times last year: “If they could come up with the right idea that extends the story and does it as well as the first three.”
Mind you, that all seems somewhat unlikely.
Last summer, director Robert Zemeckis said that there will “never, ever be, in the most absolutely way, a Back to the Future 4. There will be no more Back to the Future”.
The trilogy’s writer Bob Gale feels the same way. “Let’s face it, we’ve seen a lot of sequels that are made years and years later and I don’t think I can name one that’s any good,” he told Yahoo in 2014. “That lives up to the originals. I don’t think you can recapture it.”
However, Back To The Future lives on in musical form, and will premiere in Manchester in 2020 before transferring to London’s West End.