Waterparks are the result of humanity's hubris of science.

In this one, Ian and Liv revisit one of their favorite episodes for Disaster Hour's 3rd Birthday: Action Park! Throughout the 1980s, Action Park was an outdoor waterpark with waterslides that were straight out of a Stephen King novel. They were dangerous, exhilarating, and built with zero professional architects or rollercoaster engineers. Guests were injured, the park faced lawsuits, and the owner continued dodging the law for decades. Welcome to Action Park!

Also, Justinepremieres as a new guest. Liv doesn't know how to use a calculator. Libby has imaginary friends. Dylan continues winning at life. Bob jumped off a cliff once. Ian confuses Tony Hawk and Stephen Hawking.