I like the fact that at one point Garth refers to himself as "master of the universe
," years before that phrase entered the popular culture. Thus Star Trek
might have coined it.
The Mattel/Filmation MOTU franchise goes back to about 1983.
The phrase shows up prominently in Tom Wolfe's 1987 novel Bonfire of the Vanities
, in which Wall Street bond traders consider themselves masters of the universe.
But it looks like Star Trek
might have gotten there first.