The article summarizes notable incidents—major accidents, injuries, or deaths—at Six Flags parks, including legacy Cedar Fair locations like California's Great America, categorizing them by causes such as guest negligence, health issues, park errors, or natural events. At California's Great America, a 4-year-old drowned in the shallow Breakers Bay wave pool in 2007, and a 12-year-old died in 1999 after falling from Drop Tower due to a suspected unlocked harness. In 1998, a man was fatally struck by a rider's dangling leg on Flight Deck after entering a restricted area for his hat, and a maintenance worker was critically injured on the same ride in 2015. The park also faced security incidents, including a 2017 group assault and robbery during Halloween Haunt and a 2019 firecracker scare triggered by a robbery. Additionally, a 1989 incident saw two boys intentionally jump from Logger's Run, causing one death, highlighting a mix of tragedies, mechanical failures, and crowd-safety challenges.