The documentary “King Corn” will be shown at 6:30 p.m. Friday at the Unitarian Universalist Congregation of the Quad-Cities, 3707 Eastern Ave., Davenport.

The free showing is part of a series of environmental films on the first Friday of each month at the church.

The documentary is about two friends, one acre of corn and the subsidized crop that drives a fast-food nation. In the film, Ian Cheney and Curt Ellis, best friends from college on the East Coast, move to the heartland to learn where their food comes from. With the help of friendly neighbors, genetically modified seeds and powerful herbicides, they plant and grow a bumper crop on Iowa soil. But when they try to follow their pile of corn into the food system, what they find raises questions about how we eat and farm.