Listed in the USS Enterprise-D's database

John Mason was a notable humanoid comedian.

In 2365, Data attempted to create a comedian to help him better understand the concept of "humor". Mason was among the holodeck program files that were contained aboard the USS Enterprise-D. The program list code for this comedian was ZB-45234. (TNG: "The Outrageous Okona", okudagram)

This character was only mentioned in writing.
This character was named after producer John Mason. (Star Trek: The Next Generation Companion)
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