Narrator in “Unfinished Business”

In the days to come, when human beings navigate the great depths of space, they'll eventually come to a small planet in a distant galaxy. It's a pleasant place, but quite unlike the Earth. There's one unusual similarity, however: shamrocks grow there in great profusion. Brought they say by one Liam O'Shaughnessy, lately of Earth and now residing in one of the greener corners...of the Twilight Zone.