Muppet Babies / Season 1 Episode guide S1·E21 Upside-Down Day Aired June 29, 2018 12 min Share X f r w ⧉ Copied! SynopsisSpoiler-safe No synopsis is available yet for this episode. Rate this episode Your rating is anonymous and can be changed later. ★★★★★ Be the first viewer to rate it. Director & writersGuy MooreDirectorDan DankoWriter Advertisement ← S1E20 Season guide S1E22 →