Thelius was an Eternal and a member of the Uranian subsect who received the Quantum Bands. Calling himself Crusader, he believed he was the 1950s superhero known as Marvel Boy and went mad.
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During the Uranian Eternals' destruction, they rushed to completion a duplicate of Marvel Boy. The duplicate arose too late to be of any help, however - it was born an unstable creature with false and fractured memories. It believed that the Eternals' protective dome was destroyed, and it was the fault of bankers of Earth who stalled him when they denied his request for a loan to purchase medical supplies for his father.
