When does Harvey Birdman, Attorney at Law return?

The first season of Harvey Birdman, Attorney at Law is the first adult animated production to be produced by Cartoon Network Studios. The series uses a surrealist style of comedy, featuring characters, objects, and jokes that are briefly introduced and rarely (if ever) referenced thereafter. The pilot first aired as a sneak peek on Cartoon Network on December 30, 2000. A spin-off, Birdgirl, premiered on April 5, 2021.
Harvey Birdman, Attorney at Law is the first Williams Street cartoon to maintain continuity through the entire series. The series uses a surrealist style of comedy, featuring characters, objects, and jokes that are briefly introduced and rarely referenced thereafter. Harvey's clients are primarily characters taken from the Hanna-Barbera cartoon series of the same era.