" Brother, you are messing with the wrong god-power-wielding dude. "-- Captain Marvel
History
Captain Marvel is the World's Mightiest Mortal. Originally, he was a orphaned boy named Billy Batson, who was chosen by the wizard Shazam to be a champion of good. Shazam gifted Billy with the power of six legendary Greek figures, and when he spoke the Wizard's name, he became an adult superhero empowered by six legendary Greek figures. Later, Captain Marvel would gain the ability to share his power with Mary Marvel and Captain Marvel Jr., creating the Marvel Family. Today, Captain Marvel remains as one of the world's greatest heroes.
The Power of Shazam
Billy's parents - archaeologists C. C. and Marylin Batson - were killed by their treacherous assistant, Theo Adam, while on a dig at the tomb of Rameses II at Abu Simbel, Egypt. Theo Adam was the resurrected non-powered form of Teth-Adam aka Black Adam. He also kidnaps Billy's sister Mary, who ends up missing.
The wizard Shazam is made aware of all of these events, and (just as in the Fawcett origin) has Billy brought before him by the dark-clothed stranger, and grants the boy the power to become Captain Marvel. As Captain Marvel, Billy takes on the form of his late father, which is how Theo Adam guesses his identity, has a revelation about the power of Shazam, and becomes Black Adam using a scarab he stole from the tomb. After subduing Black Adam and his employer, the rich tycoon Doctor Sivana, Billy swears to find his sister as Captain Marvel.
Captain Marvel became a member of the revived Justice Society of America and was featured prominently in that group alongside his nemesis Black Adam. Captain Marvel had originally joined the team to keep an eye on Adam, who had joined the JSA claiming to have reformed. Black Adam eventually left the JSA to instigate a takeover of his home country of Kahndaq; he had a fondness for the country, and wished to see the totalitarian regime done away with, in what he saw as justice. Captain Marvel remained with the team.
JSA
During his tenure in the JSA, Marvel dated Courtney Whitmore, also known as Stargirl, which put him in an unusual position; while he could legally date Courtney as Billy Batson, it looked very strange for the grown-up Captain Marvel to be with the teenaged Stargirl. The Golden Age Flash, Jay Garrick, another JSA member, confronted Marvel about the issue. Rather than telling Garrick and the team the truth about his age, Marvel chose to follow the Wisdom of Solomon and leave the team and Courtney.
The Marvel Family played an integral part the Infinite Crisis. The climax of the Day of Vengeance saw the Spectre engaged in a cosmic-level battle with the wizard Shazam. At the conclusion of this battle, Shazam was obliterated, and the Rock of Eternity burst apart into Earth's dimension, freeing scores of ancient magicks and evils that had been captured eons ago back into the Universe.
Day of Vegeance
In the aftermath of the Day of Vengeance, Day of Vengeance, Captain Marvel and the Marvel Family then helped Zatanna and several other beings to capture the Seven Deadly Sins and rebuild the Rock of Eternity. Captain Marvel was then required to take over Shazam's role as caretaker of the Rock. Marvel was later shown fulfilling this role, although teetering on the brink of insanity, constantly talking back to the Seven Sins around him. During this time, Marvel was shown helping Black Adam grant Adrianna Tomaz the powers of the goddess Isis. Later that year, Captain Marvel presided at the marriage ceremony of Adam and Isis in Kahndaq.
52 and World War 3
Black Adam's continued attempts to reform, and depicted Adam's formation of, with Captain Marvel's blessing, a "Black Marvel Family". Joining Black Adam in the Black Marvel Family were his wife Isis and her brother Osiris. Isis and Osiris are murdered by the "Four Horsemen", creatures engineered by a team of DC's mad scientist characters (Dr. Sivana among them). As a result, Black Adam takes his revenge out on the entire world, killing millions. Black Adam is halted for a few minutes, just the time needed for Captain Marvel to force a magic lightning bolt on him, turning Black Adam back to Teth-Adam and changing his magic word into an unknown one.
