Last time we saw Kes on Voyager, she was pretty damn powerful.
Throwing a ship a distance covering 10 years at high warp, in only a few seconds.
i thought the last time we saw Kes, she was killing people because of Ocampan PMS or something…did she knock the ship forward again in that episode? i couldn’t watch it, my stomach is too weak to swallow that tripe.
Actually, the only accurate answer to the OP would have to name first:
Roddenberry
Hold on!! I must debate the Rodenberry answer!
As his control was always fleeting and his direct interventions were pretty weak.
He may have created the Trek universe but others did better (And worse) with it. Who would argue that the later seasons of STNG were hundreds of tiems better then the first two and a half, is it not also the time when Mr Roddenberry let loose his control. Mind you he would never have ok’s that horrible Voyager series.
The most powerful beings in the Star Trek universe are the captains of the star ships Enterprises and Voyager. They always defeat or outwit the enemies no matter how powerful the enemies are.
Geez. Where’s the Voth? (The UberDinosaurs)
It’s not going to be popular, but maybe we should restrict ourselves to TNG. There was a godlike being in every other episode in TOS, IIRC, and we never heard from any of them again. One of those joining the federation would have done wonders. In voyager Q (and the borg) turn out to be a load of muppets. In DS9 can you think of anyone but the prophets?
You are right it’s not popular (at least with me 
) The Star Trek Universe covers everything not just one show. You may oppine that you preffer one species from that series over all but let’s face it You can’t ignore the rest (even Voyager) and give an honest answer.
You scoff. Don’t you remember the tagline for the novel Q-In-Law? “Two of the most powerful forces in the galaxy are about to collide…” !!
Species 8472 (from Voyager)
How do you know that it wans’t actually the Romulans who defeated the Q and all those other supreme beings. How do you know that we aren’t seeing the result of some highly speciesist reporting?
Obviously we can’t forget about the Caretaker from Voyager. Or the creature that killed Tasha Yar on TNG. Or how about the creatures from the original Star Trek series that wanted to see good battle evil and recreated dead heroes and villians to fight like Abraham Lincoln and Ghengis Khan simply by reading the humans minds?
Because it has been clearly shown that the humans are far too enlightened and fair-minded to stoop to the level of the “lesser” species in the universe…wait, I’m just proving your point for you, aren’t I? 
Considering that episode made me bang my head on the wall for how Stupid stupid stupid the plot of that episode was, the Voth never existed. that whole episode was a holodeck program, probably written by Naomi Wildman, since her character is almost as stupid as the concept of Dinosaurs building a spaceship and flying away from earth.
I will nominate Stupid Voyager Writers as the most powerful beings in the universe, because they puked into a typewriter and beat it with a bag of cow manure, and out came concepts like the Voth. Then they got paid for it.
that guy couldn’t even make it off his planet.
and yes, i am going to be hyperbumping a lot of old ST threads.
(1) Armus, the melted-fudge monster: http://memory-alpha.org/wiki/Skin_of_Evil
(2) The Excalbians: The Savage Curtain (episode) | Memory Alpha | Fandom
All pikers compared to the Organians, Metrons or Q.
IIRC, wasn’t there a canonical novel where the Q continuum decided to let the humans take care of the borg instead of the Voth? It gave the impression that the Q were powerless to stop the borg.
Has there ever been a canonical Star Trek novel?
There’ve been some very, very good ones (I’d nominate Dark Mirror by Diane Duane and Imzadi by Peter David), but none are ST canon as far as I know.
Wesley Crusher!
That stench could sterilize a large galactic cluster…
Actually, I half liked the little guy.
What does God need with a Starship?
Ripped Shirt Kirk, Scalosian watered Spock, Tribbles …