American Ultra: A 'stoner assassin romantic comedy'

American Ultra - out this week - is an action film with leads not normally associated with the genre: Kristen Stewart of Twilight series fame - and Jesse Eisenberg, possibly best known for The Social Network.

The new film offers not just action, but also comedy and romance in a story which chronicles the adventures of a sleeper agent, played by Eisenberg, who when activated finds he has become a killing machine.

Talking Movies' Tom Brook reports.