The new roller coaster will lift riders up 12 stories along a 90 degree lift, a spokesperson said. Then the thrill begins.
Riders will flip head-over-heels at least six times along the weightless journey.
Watch the video in the player above to see what The Joker will be like and look for the new ride at Six Flags theme parks next year.
The park closest to Chicago is located in north suburban Gurnee.