"Plastic Spaceman" is one of the two deleted songs from Disney/Pixar's 1995 animated feature film Toy Story, written and performed by Randy Newman. It was replaced by I Will Go Sailing No More.
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https://www.youtube.com/watch?v=JI_mFPuHNos
During the production of Toy Story 2, Pixar animator Steven Barnes threw in this gag animation while the team was looking over the footage for "Jessie's Sad Story."
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https://www.youtube.com/watch?v=7jGqcPCVuZ0