It's been more than three years since The Human Centipede 2 (Full Sequence) upped the original film's ante of three unfortunate victims, dangling a 12-person human centipede in our faces. Now, after years of being promised something even bigger, we've finally got a light at the end of the tunnel. Human Centipede Part 3 (Final Sequence) will hit theaters in limited release and on demand starting on May 22.

And thanks to Entertainment Weekly, we have an official synopsis as well: 

Bully prison warden Bill Boss (Dieter Laser), leading a big state prison in the US of A, has a lot of problems; his prison statistically has the highest amount of prison riots, medical costs and staff turnover in the country. But foremost he is unable to get the respect he thinks he deserves from his inmates and the state Governor (Eric Roberts). He constantly fails in experimenting with different ideas for the ideal punishment to get the inmates in line, which drives him, together with the sizzling heat, completely insane. Under threats of termination by the Governor, his loyal right hand man Dwight (Laurence R Harvey) comes up with a brilliant idea. A revolutionary idea which could change the American prison system for good and save billions of dollars. An idea based on the notorious Human Centipede movies, that will literally and figuratively get the inmates on their knees, creating the ultimate punishment and deterrent for anyone considering a life of crime. Having nothing to lose, Bill and Dwight create a jaw-dropping 500-person prison centipede.

Laser and Harvey, who played the villains in the first two Human Centipede movies, return to star in a pair of all-new roles.

Source: Entertainment Weekly