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The Bass is one of many Muppet fish that appeared in the Splish Splash musical number from The Jim Henson Hour episode 102. Later, the puppet appeared on Muppets Tonight! in Episode 106: Tony Bennett in the NYPD Green Sketch.
The Bass on Muppets Tonight in "NYPD Green."
The Bass in "Splish Splash" from The Jim Henson Hour.