Six Flags Discovery Kingdom
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Six Flags Discovery Kingdom is a 135-acre animal theme park located in Vallejo, California, off of Interstate 80 between San Francisco and Sacramento. The park includes a variety of roller coasters an
Logo used since 2025
SkyScreamer and Medusa in 2023
1970 orca show at the original Marine World in Redwood City
People walking at Six Flags in Vallejo
The Joker is a steel roller coaster at Six Flags Discovery Kingdom in Vallejo, California. The ride opened on May 29, 2016, as a rebuild of former wooden roller coaster Roar, adding a new steel track
Six Flags Discovery Kingdom
…July 16, 2015, the park announced that Roar would close on August 16, 2015. On September 3, 2015, the park announced their tenth major thrill coaster, The Joker, which is a hybrid transformation of Roar. The conversion was performed by Rocky Mountain Construction. The coaster features a 100-foot height, a…
Six Flags Discovery Kingdom
Roar in 2009