Guess the Episode [Medium]
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Is it the one where he learns how to fix the ship and finally understands the Professor?
A Clone of my Own
When the Sunset Squad Robots take the professor off to the old people world due to him turning 160 years old. Fry, Leela, Bender, and Qubert rescue him and along the way Qubert finally reconciles with the professor.
It's the Near Death Star, actually.