Set in the 18th century, the film recounts the exploits of Rogers' Rangers, a band of adventurers devoted to seeking out a "northwest passage" through Canada. At this juncture, however, Major Rogers is more concerned with helping the British forces at Fort Ticonderoga during a series of French and Indian raids. Fort Ti was filmed in 3D, and in typical William Castle fashion the stereoscopic gimmick is exploited to the hilt.