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Jim Henson and George Lucas.
George Lucas (b. 1944) was an executive producer for Labyrinth.
He is perhaps best known for creating the Star Wars saga, which was filmed in the same studios as The Muppet Show. A few of the characters he created for Star Wars would appear as the guest stars of a fourth season episode of The Muppet Show.
He was also heavily involved in the Indiana Jones movies.
A George Lucas Muppet appears in episode 31 of From the Balcony, being interviewed by Ted Thomas Sr.