Well , here we go again.
Of the fab four from Star Trek, Shatner,Nimoy, Kelley and Doohan, what was it Kelley did first, or made him stand out from the other three?

Clue # 1 - The answer can be deemed in terms of milestones OR relationships.

Clue # 2 - Majel Barrett might be in the mix...somehow!!!

I only have one answer left out of three, a little help?

Thanks,

- Roog -

So, I had to wave the white flag on this one.
I'll share the answer for any of you who did make an effort to answer that.

1960.

333 Montgomery Avenue.

An episode in a t.v. anthology series.

Written by a young Gene Rodenberry.

Thus making DeForrest Kelley the first of the group to work 'with' Roddenberry.