He landed the role on MASH after appearing in the little known Godzilla movie Godzilla vs. Alan Alda. In this role he was shown to be about equal in stature with Godzilla. They battled to a draw, Godzilla's radioactive breath negated by Alan Alda's reflective glasses.
"How is Godzilla the same size as a human actor?" -Akira Kurosawa upon learning of Godzilla vs. Alan Alda