This includes fantasy and sci-fi.
My choice is the Combine.
A multi-universal species from half-life so absolutely immense and powerful that they reverse-engineered earth's technology, upgraded far beyond human ability, brainwashed some humans and had them invade themselves. They did this and stomped all resistance within 7 hours. This was done by a backwater lesser combine city mind you.
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Lantern corps or Kryptonians
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Precursors.
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Dark elves from es
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The Yuuzhan Vong
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Forerunner
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Op because fgts
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LOTR Silvan Elves
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Asgardians.
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I know I know, gtfo desticle, but the vex seem like they're pretty much invincible. Can teleport across the universe in an instant, can time travel, can turn planets into machines that make more vex, not to mention their sheer numbers.
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God's #Rekt
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Cybertronians nuff said
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Asari
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The Consu from Old Man's War by John Scalzi. http://en.m.wikipedia.org/wiki/Old_Man%27s_War
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Who were those guys from Star Wars' EU that were almost invulnerable to the force? It's them.
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*Insert religion related comment*
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Post - DBZ Saiyans. This is half-breeds and all Saiyans who fall under the dragonball timeline during the era of the 'Time Police', in which going to Super Saiyan is a common rather than a rarity.
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Precursors
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I remember that line in Halo 4, Lasky said it. "We were once the weaklings, but now, Chief, we are the superpower, the human race is the most powerful species to date"
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Precursors from halo
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Humans