The first trailer for the highly-anticipated new Bill & Ted movie, Bill & Ted Face The Music, has been released.

The cult sci-fi comedy franchise, starring Alex Winter and Keanu Reeves as two time-travelling layabouts, began with Bill & Ted's Excellent Adventure in 1989, followed by first sequel Bill & Ted's Bogus Journey two years later.

Plans to complete the trilogy have been in the works for more than a decade and the movie finally got the go-ahead last year, with both Winter and Reeves on board to reprise their roles as the now-middle-aged best friends who are tasked with writing a song that will save the world.

Watch the trailer for Face The Music, which is due for release on August 21, below: