Heaps

Two "Heaps" first appeared in The Muppet Show: Sex and Violence sketch Aggression. The two hostile creatures are described in the original script as "gross clumps of crud - fabric, feathers, and foam," and inflict pain on each other and an unimposing stalk. The Purple Heap pummels others with a club, while the Green Heap punches with his fist. The script also notes that they speak in unintelligible guttural sounds.

The two heaps made further appearances on The Muppet Show, only occasionally seen together. In one notable appearance, the Green Heap is seen on the Planet Koozebane in Episode 415, although it's unclear whether or not he was supposed to represent a species indigenous to the planet. Unusually, he is interchanged with the Purple Heap in a backstage scene later in the episode.

Green Heap

 * The Muppet Show: Sex and Violence
 * The Muppet Show
 * Episode 103: Joel Grey ("Comedy Tonight")
 * Episode 107: Florence Henderson (At the Dance)
 * Episode 119: Vincent Price ("You've Got a Friend")
 * Episode 202: Zero Mostel (Fears of Zero)
 * Episode 311: Raquel Welch
 * Episode 415: Anne Murray ("Trudge Trudge Streak Streak", performed by Frank Oz)

Purple Heap

 * The Muppet Show: Sex and Violence
 * The Muppet Show
 * Episode 107: Florence Henderson (At the Dance, performed by Dave Goelz)
 * Episode 119: Vincent Price ("You've Got a Friend")
 * Episode 202: Zero Mostel (Fears of Zero)
 * Episode 307: Alice Cooper
 * Episode 415: Anne Murray