According to the Mean Mama page at Muppet Wiki, Mean Mama's last appearance was in an episode of Dog City (and the page has a picture from her appearance). However, it is not said which episode she appeared in. I checked "what links here" but couldn't find any Dog City episodes, and then I looked through every episode page and couldn't find any that mentioned Mean Mama or showed a picture from her scene. Hmm, I should have posted this thread a few months ago when I wrote the Mean Mama "Weekly Muppet Wednesday" article for The Muppet Mindset. Being able to list the exact episode under "most recent appearance" would have looked better than writing "Dog City, sometime between 1992 and 1994"(which I think Ryan changed to the slightly better-looking "circa 1994", but knowing the actual episode would still be good).