Walking though the Manchester Opera House foyer a week before the first performance of Back to the Future: The Musical means picking your way through piles of props and kit that are waiting to be slotted into place before opening night.
A skateboard and some of the Doc’s scientific equipment are lying around, and a crew member walks past carrying what look like dancers’ 1950s dresses. The components of the Doc’s nuclear-powered flux capacitor are probably spread around somewhere.
A DeLorean car is on stage, swimming in coloured lights and dry ice.
“Avert your eyes,” says the theatre manager, half joking, as she escorts me to a backstage room to interview the team behind the show.