Malcolm Duncan

A seemingly ordinary young resident of “Hell’s Corner” in Harlem, Malcolm "Mal" Duncan possessed no special powers beyond his quick wits and pugilistic skills he had developed as an amateur boxer. This along with the Gabriel Horn (which allowed him to open portals and generate sonic blasts) made him a fearsome crime-fighter. He is also an accomplished jazz musician and owns a nightclub named Gabriel's Horn.

Background Information
In the parallel universe of Earth-One, Mal was noticed by the Teen Titans when he saves them from a racist street gang called the 'Hell Hawks' by beating their leader: first in a good ole’ fashion brawl then in the boxing ring. Mr. Jupiter (a friend of Bruce Wayne’s and a mentor and benefactor to the Titans) had sent the teens on a mysterious assignment to 'Hells Corner.' Mal and the Titans then drove the thugs away, forming a fast friendship in the process. Soon after, he was recruited by the Titans and entered into Mr. Jupiter’s survival training program located. It would not be long however, before Mal began to doubt his abilities when he compared himself to his enhanced colleagues.

As fate would have it, a few months after Mal joined the Titans, they took a hiatus from working together leaving Mal to contemplate his place on the team. During this period of Titans inactivity, Mr. Jupiter closed down his training program and Mal was selected to keep watch over the group’s headquarters and equipment until such time as they should resume operations. It was during this period that Mal met Karen Beecher, a New York librarian. The two would soon fall in love.

About two years later the Titans receive an emergency signal, which Robin, Kid Flash, Wonder Girl and Speedy to their former headquarters, it turns out to be a trap set the deranged Dr. Light. He intends to use the Titans as bait to trap the Justice League. He captures Robin and Wonder Girl, then stops Kid Flash and Speedy before they can warn their adult counterparts of his plans. Mal, realizing that he is unable to defeat, Dr. Light on his own, heads back to the Teens lair to search for something useful. While there, he finds an exo-skeleton (which Robin had in his locker) and the Guardian's costume from the Titans' storeroom and becomes the new Guardian. Now costumed, he is able to free his fellow friends, and together they defeat Doctor Light and later revive the Titans team once again.

Shortly after assuming the Guardian mantle, Mal fights and defeats Azrael (aka the Angel of Death). He believes this to have been a mere hallucination until he awakens to find himself in possession of a mystic horn given him by the angel Gabriel. By defeating Azrael, Mal has won the right to life, but if he should lose a fight—to anyone—he must die. Gabriel's horn, when blown, gives him unspecified powers to use whenever the odds are against him in battle. Now, armed with the horn, Mal gives up his identity as the Guardian and assumes the name Hornblower. Mal is reconciled with the team, and joins Roy Harper's rock band, Great Frog. Bruce Wayne also agrees to finance a new Teen Titans headquarters.

After disappearing for a short time with his mystic horn in the guise of the ‘Hornblower’, he returns to his identity as the Guardian claiming that people know that Mal Duncan and Hornblower are one and the same.

Soon after an adventure with the Titans West team, the Titans disbanded once more.