Flex Doozer is a Doozer who goes missing after Boober's hat covers his head and obscures his vision, causing him to wander off into the Gorgs' garden. He appears in the Fraggle Rock episode "You Can't Do That Without a Hat," and is the first individual Doozer in the series to play a role in the plot of an episode. He is one of two Doozers, along with Flange Doozer, to go into the Gorg's garden.