Bill & Ted Face the Music sees one of our favourite film buddy pairings Bill S. Preston Esq. (Alex Winter) and Ted Logan (Keanu Reeves) being responsible fathers to their daughters, appropriately named Billie (Brigette Lundy-Paine) and Thea (Samara Weaving).
In an earlier draft of the film's script the pair actually had sons instead of daughters – but writers Chris Matheson and Ed Solomon, having imagined the children as boys since the '90s, decided to swap Will and Theo for female counterparts late in the writing process.
Matheson and Solomon decided that the sons were just too similar to the original Bill and Ted, and so they started looking at ways to differentiate the kids from their fathers.
"When we wrote (second film) Bogus Journey in '91, little Bill and little Ted are on their backs at the end of the movie, and little Bill and little Ted and, in my mind and I think in Ed's mind, they were sons," Matheson told CBR.
"I mean, it was just like, 'Well, right. Of course they are,' because that's where we were at that point in life."
But the pair soon found themselves changing their minds, as they just couldn't get Will and Theo to work as characters.
"We wrote Will and Theo for several drafts, and it just never really worked, because they were either little carbon copies of their dads – they're just like Bill and Ted again at 16 or 18 – and we didn't like that, because that just didn't feel funny or cool, or they were cool guys," Matheson continued.
"They were kind of little hipstery guys, and we just could not seem to find the comedy in that. So at a certain point, we thought, 'Why don't we try making them daughters?' and we did that and, very quickly, it made the script work a lot better.
"It made the story work a lot better. It made the characters work better. It made the relationships between parent and child more interesting, more alive."
Solomon added that they had been "banging our heads against the wall", until they hit on the idea of making the younger generation girls.
"What if we did it this way? What if we made them daughters?" he said. "And we went, 'Right! What if we did?' and we fleshed it out that way. I just think the whole movie has a different feel because of that, honestly.
"Obviously, I'm really glad we did it that way. Sam and Brigette are wonderful."
Bill & Ted Face the Music is due for release in cinemas in the UK on September 23. It will be released in cinemas and on VOD in the US on August 28.
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