Based on the enormous popularity of daredevil Evel Knievel, Hanna-Barbera developed this cartoon about a stunt motorcyclist working in a travelling circus. Ernie, Todd & Sandy Devlin were part of Hank's circus.  Ernie's the motorcycle stunt driver while Todd's his mechanic. An episode of Harvey Birdman Attorney at Law featured a washed up Ernie Devlin after a child attempted to do a motorcycle stunt in which the boy sued Ernie after being injured.