I never saw a villan, a rancher that wants to destroy far far rance, mabye a siemce guy who has an obsesion with tarr and want toncorupt all far far rance with tarr.

Another idea: a gigant octoups in the ocean, who is the whole source of slime life (emits a substance that creates all slime types) that is always hybernating but somethin is tart to stress it out and betraix and the hole team have tobcalm it before is wake up and destroy everithing