Buffy the Vampire Slayer director Joss Whedon has refused to rule out a big screen adventure of the hit 90's television series.

Whedon, who created the hit show which ran from 1997 to 2003, hinted that a Buffy movie could be on the cards in the future.

When asked if there was any chance of Angel and the gang hitting the big screen, he told BANG Showbiz: ''Never rule anything out, but I haven't got anything planned at this stage.''

The 50-year-old also spoke about the challenges he faced making Avengers: Age of Ultron: ''Everything [could be better]. The problem with a film like this is that you get into this momentum when you're editing and you don't really get to stand back and look at it.

''These screenings are almost test screenings for me, but unfortunately they're test screenings where you've already passed fail. You can't make it up later.

''The biggest challenge was the script stage and the editing stage - shooting it was a delight. Figuring out what to keep and what to cut was excruciating.''

Avengers: Age of Ultron is in cinemas now.