Iron Wolf

On April 28, 1990, Iron Wolf opened at Six Flags Great America on the former site of Z-Force (the only Intamin Space Diver ever manufactured). It debuted in 1990 as the tallest and fastest stand-up roller coaster in the world. Its height record was surpassed in 1992 by Milky Way at Mitsui Greenland, which stands at 125 feet (38 m), and its speed record was exceeded by Mantis at Cedar Point in 1996, which had a maximum speed of 60 mph (97 km/h).

In 1994, Iron Wolf appeared in the movie Richie Rich as Richie's backyard roller coaster.

On August 5, 2011, Six Flags Great America announced on their official Facebook page that the Iron Wolf would be closed on September 5, 2011: "After a long 21 year history at the park, we will be removing Iron Wolf. Make sure to get your last rides in – Iron Wolf’s Last Stand is September 5". 'The Last Stand' is also a reference to the slogan afforded to Apocalypse. Iron Wolf's former site would be taken over in 2014 by a custom RMC coaster, Goliath.

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