The film is about Stephen who arrives home after six months away to discover his best friend Roy has replaced him with a ventriloquist doll called Roger.
The self-funded film was shot over a couple of days in London in February 2016.
Talking about the stars, writer/director Brendan Cleaves says: "John and Seann were hilarious together. It was like they'd been best mates for years." Writer Stuart Foreman adds: "We're delighted with what we shot and can't wait to share it with the world. Hopefully this will lead to something even bigger."
To help with post-production costs, a Kickstarter campaign has been setup. Rewards for early backers include an on-screen associate producer credit, signed scripts and VIP tickets to the London screening.