Winchell voiced the villainous Dick Dastardly in Hanna-Barbera's "Wacky Races" and its spin-off "Dastardly and Muttley in Their Flying Machines". This role showcased his talent for creating memorable and distinct voices.

Winchell became the definitive voice of Tigger in Disney's "Winnie the Pooh" franchise, bringing the character's bouncy and energetic personality to life. He voiced Tigger in numerous films and television shows for over 30 years.

Winchell voiced the evil wizard Gargamel in "The Smurfs" animated series, creating a distinctive and menacing voice that became synonymous with the character. He was the original voice actor for Gargamel, and his contribution made the character iconic.

Beyond Tigger, Dick Dastardly and Gargamel, Winchell lent his voice to many other animated characters in shows like "The Perils of Penelope Pitstop", "Goober and the Ghost Chasers", and various commercials and educational films.