Comedy · United States of America · 1979 · 2m Grump Critic ✓ Seen + Watchlist ↗ Share No poster Director Cast Jim Henson as Leo Frank Oz as Grump Jon Stone as Announcer (voice) Synopsis "Leo asks Grump to give him a signal if his speech gets boring." (Muppet Wiki) Key Collaborators Follow the Thread More Comedy → Agent-readable