Upon reentry, Starfleet assigns him Sox to help ease his transition into the current time.
Director Angus MacLane knew right away that Sox would be a hit.
MacLane could already tell what was working about his deliveries at that time.

Sox (voiced by Peter Sohn) and Buzz (Chris Evans) in ‘Lightyear’.Disney/Pixar
“Sox was one of the first character models that were built.
The world premiere was the first time MacLane and his producer Galyn Susman had seenLightyearwith a live audience.
One of those notes, she remembers, was “more Sox!”

Disney’s ‘Lightyear.'.Disney/Pixar
So it wasn’t always super helpful.
But the premiere screening with the cast in attendance confirmed their long-held belief.
“He’s in there just enough not to over weigh the movie towards the Sox picture.”
Lightyearis currently playing in theaters.
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