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The Triumvirate of Terror consist of Hammerhead
and their leader, the Mad Thinker
. The Mad Thinker devised a scheme to destroy all the Avengers
while their leader, Captain America
was away on another assignment. Hammerhead was able to defeat Hawkeye
in battle and he became their first prisoner. Goliath
tracked an SOS signal to an excavation site where they were defeated by Pile-Driver. Scarlet Witch
were defeated by Thunderboot and all five Avengers were strapped to a restraining shaft. Mad Thinker wanted his henchmen to steal all the Avengers' electronic equipment and have it transported back to their headquarters. Mad Thinker was off his calculations and did not anticipate Hercules
to arrive at the mansion. Hercules engaged his enemies and managed to free his teammates when he smashed the restraining shaft. The Avengers made quick work of the Mad Thinker and his Triumvirate of Terror.
The Triumvirate of Terror was created by Roy Thomas
and Don Heck
in 1967 and first appeared in The Avengers