Gemini is a racing roller coaster with a wooden structure and steel track located at Cedar Point in Sandusky, Ohio, United States. Built in 1978 by Arrow Dynamics and designed by Ron Toomer, it is one of the oldest roller coasters still operating at the park, with only Blue Streak, Cedar Creek Mine Ride, and Corkscrew being older. Cedar Point marketed the ride as the tallest, fastest, and steepest roller coaster in the world, despite taller and faster coasters that had opened sooner.

A dual-tracked roller coaster is a roller coaster that consists of two tracks. They can be configured as racing, dueling, or Möbius loop roller coasters. Some dual-track coasters operate only one track side at a time, including Rolling Thunder and Colossus. Others may opt to run one side facing frontward and one side facing backward.