Episode 0084 - which has Oscar the Grouch performed by Jim Henson instead of Caroll Spinney.
muppet.fandom.com
Back In 2003, somebody on the Toughpigs forum got in contact with Karen Falk, who confirmed that Caroll Spinney was sick for a few episodes so Daniel Segren performed Big Bird and Jim Henson did Oscar. While we knew Segren did Big Bird in episode 83, we didn’t know when Henson was Oscar, though I figured it was that week.
i can’t remember if the wiki already mentioned that Jim was Oscar in at least one episode, but it was something I was curious about, I wondered if Falk’s source was mistaken. Considering how rare it was for Jim and Frank to perform in street scenes that season and that it was rarer for Jim to do street scenes than the other performers in the early years, I wouldn’t have been surprised if it was an error (which it obviously wasn’t).
but I wonder what it was like, suddenly needing more performers on set while Caroll couldn’t make it. Jim was busy with a lot of things, interesting how one of his few first season street scenes had him doing somebody else’s character - and in an episode where they just happened to also have Frank on set (and had Oscar and Rufus appear together).