* The first actor was Phil Leeds, who played Morty Seinfeld in the first four seasons of the show. He had a very distinctive voice and appearance, which made him memorable. Sadly, Phil Leeds passed away in 1998.
* The second actor was Barney Martin, who took over the role of Morty Seinfeld from season 5 onwards. Barney Martin had a different style and mannerisms, but he still brought a lot of humor to the character.
It's interesting to note how the change in actors actually contributed to the show's evolution. The early episodes often featured Morty as a more bumbling and clueless character, while Barney Martin's Morty was more of a wise-cracking, occasionally irritable figure.