"What is this thing?"
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Omega (Ω) is the Greek letter for "great" or "end". Omega may refer to several subjects in the Metroid series. Each one shares a close similarity to the name's concept:
The Omega Cannon
, the final and most powerful beam weapon in Metroid Prime Hunters
The Omega Metroid
, the final and most powerful stage in the Metroid life cycle, aside from the Queen.
The Omega Pirate
, the most powerful Elite Pirate in Metroid Prime
, the final Leviathan guardian in Metroid Prime 3: Corruption
and most powerful form of Ridley.