Hefty Smurf is a very strong Smurf in the Smurfs series. He, Papa, and Brainy appeared with Pooh and Tigger in Cartoon All-Stars to the Rescue.
In The Smurfs and the Magic Flute, he was voiced by Michael Sorich. In the 80's series, he is voiced by Frank Welker, who also does Scooby-Doo, Fred Jones, and many others. In the live-action film series and Sony animated shorts, he is voiced by Gary Basaraba. He will be voiced by Joe Manganiello in the upcoming fully animated Smurfs: The Lost Village.
In the cartoon, he is the one who finds Smurfette and brings her to the village.