A series of complex experiments gave our hero his amazing strength and toughness, but robbed him of any mental capacity, leaving him with simply an overwhelming desire to help others. As he began to explore Paragon City, he tried to help others by pointing out things they might not be aware of. As he helped others, he began to notice that people all thanked him with "Thank you, Captain Obvious!"
Ignorant of the concept of sarcasm, he believes these people must know him from his deeds, and has taken the name they called him as his own...