LOS ANGELES, Jan 26 — Sci-fi thriller Mercy starring Chris Pratt debuted atop the North American box office with US$11 million (RM43.6 million) in ticket sales, ending the five-week reign of Avatar: Fire and Ash, industry estimates showed yesterday.

Pratt plays a man on trial for murdering his wife in the Amazon MGM Studios film, with his fate in the hands of an artificial intelligence judge.