This film is part of the Science on Screen season at the Barbican. Full details here.
Chicago Reader review:
Priceless sci-fi schlock from 1973, with James Brolin and Richard Benjamin as role-playing guests at an amusement park whose three historical fantasy lands—Roman World, Medieval World, and Western World—are staffed with humanoid robots eager to be fucked or killed. “Nothing can go wrong,” purrs a voice on the public-address system at the beginning, so of course the robots malfunction and start murdering patrons. Yul Brynner reprises his gunslinger character from The Magnificent Seven in cyborg form, methodically stalking Benjamin through all three locales. The movie was Michael Crichton's feature-directing debut; he later recycled the Disneyland-run-amok concept to even greater commercial success with Jurassic Park.
Here (and above) is the trailer.