Mercy is a 2014 American supernatural horror film written by Matt Greenberg, directed by Peter Cornwell, and starring Frances O'Connor, Shirley Knight, Chandler Riggs, Joel Courtney, Dylan McDermott and Mark Duplass. It is loosely based on the 1984 short story "Gramma" by Stephen King. It was produced by Jason Blum for his Blumhouse Productions banner and McG. The film was released straight to video by Universal Pictures Home Entertainment on October 7, 2014.