Top Definition
In Marvel Comics, Imperius rex is a yet undefined battle cry uttered by Atlantean King Namor the Submariner whenever he goes into battle.
"Imperius Rex"
-Namor when he charges into Battle

"Imperius Rex"
-Namor when he banned surfacers (us) from the ocean

"Imperius Rex"
-Namor when he and his Atlantean army assists Captain America during the Marvel Civil War
by D_H @ Canada November 11, 2007

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