When I.R. Baboon gets jealous that I.M. Weasel has been 1st on Mars, Jupiter and Uranus, Weasel rejects NASA's plan for sending him to the Sun, which gives I.R. the chance to be the 1st astronaut to Sun.
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[1st lines after episode titlecard
I. R. Baboon
I.R. Baboon astronaut, working NASA astronaut, I.R. bump the clouds so high like an astronaut in the sky.
[I.R. bumps into a golden Weasel statue