Dr. Seuss published the original Horton Hears a Who! in 1954. In that concise moral parable, JoJo is an obscure background figure who barely registers until the final stanza, where he is caught slacking off with a toy while the rest of Whoville fights for survival. When Blue Sky Studios animation took on the project under directors Jimmy Hayward and Steve Martino, screenwriters Cinco Paul and Ken Daurio faced an immediate narrative problem: Whoville needed personal stakes.
The writing team solved this by expanding the family of Mayor Ned McDodd, voiced with manic energy by Steve Carell. The film established Ned as a well-meaning bureaucrat juggling municipal panic alongside the Mayor of Whoville 96 daughters and exactly one son. JoJo was positioned as the sole heir expected to inherit the civic mantle, yet he refused to speak, march in town parades, or adopt Whoville's relentless pastel cheerfulness. This dynamic anchored the speck-level story in family friction, giving the clover speck Whoville crisis an emotional counterpart on the ground.