Lord Balthazar
Lord Balthazar (also simply known as Balthazar) is the overarching antagonist who has appeared in the 1981 Smurfs cartoon show since The Smurfs' Springtime Special in Season 1 up until around Season 8. He is Gargamel's cruel godfather.
He also has his pet raven that he uses on various occasions, as well as a sea serpent who swims around in a moat guarding his master's castle.
He was voiced by the late Keene Curtis, who also voiced the Pastmaster from SWAT Kats.