A slightly different slant on the 'slacker' comedy genre directed by 'Friends' star David Schwimmer.
Five years ago Dennis (Simon Pegg) was at the altar about to marry Libby (Thandie Newton), his pregnant fiancee.
He got cold feet and headed for the hills, and he's been going in circles ever since.
When Dennis discovers Libby's now hooked up with high-flying go-getter Whit (Hank Azaria), he realises it's now or never.
Assisted by his friend Gordon (Dylan Moran), he decides to enter a marathon to show he's not a quitter but then finds out just how much sweat, strain and pain it takes to run for 26 miles.
No one rates his chances, but Dennis knows this is the only way to stop being a running joke.