On 13 May 2011, Optimum released Attack the Block, Cornish's directorial debut, which was executive produced by his friend and collaborator, Edgar Wright, and produced by Film4, Big Talk Pictures, The UK Film Council and StudioCanal. The film is a science fiction action comedy horror film set in South London that pitches a gang of youths against an alien invasion. The film initially had no US distributor, but after the reaction of the press and attendees at the SXSW premiere, the US rights were purchased by Screen Gems for theatrical release on 29 July 2011.