Old MacDonald had a farm. He has appeared on Sesame Street many times over the years, beginning in the 1980s, and has been performed over the years by Richard Hunt, Martin P. Robinson, Jerry Nelson, and Joey Mazzarino. He usually has a slight Scots accent, and appeared in two Sesame Street News Flash sketches in which Kermit the Frog investigates events on the farm.
Old MacDonald has also introduced music videos by The Oinker Sisters and occasionally been involved in street storylines. On one such occasion, Shelly the Turtle wanted to join his farm menagerie, and be added to the song.
In most appearances throughout the 1990s, the old farmer was a Green Anything Muppet. However, he reverted back to his original Pumpkin form when he appeared in the Elmo's World episode "Farms." His most recent appearance on the show was in episode 4208.