“Shatner sat for the mask, or approved it.”
Myth
Correction
No account has Shatner sitting for Don Post Studios or being consulted.
Both origin stories say the studio used a cast that already existed: Shatner says it was made during Star Trek for prosthetic work; others say it was taken for The Devil's Rain. The license was Paramount's. Shatner on his stake: "I don't have a piece of the film."
What people actually said
“All I can tell you is, they found it somewhere in a toy store or somewhere. I don't have a piece of the film.”