Viper was a steel roller coaster located at Six Flags AstroWorld in Houston, Texas.

It consisted of a single loop and was demolished with the closing of Six Flags AstroWorld on October 30, 2005.

Its paint scheme is different and the tunnel on the Silver Bullet surrounds the final turn as opposed to the drop hill.

On April 4, 1981, Jet Scream officially opened at Six Flags St. Louis.

On September 12, 2005, Six Flags announced the closure of the AstroWorld theme park.