Alan Scott aka The Golden Age Green Lantern is one of the supporting protagonists in Batman: The Brave and the Bold.
He is voiced by Corey Burton.
The Starheart, a magical entity, was imprisoned in an orb by the Guardians of the Universe. It landed on Earth and saved a man named Alan Scott from a train wreck. Scott followed its instructions and forged a power ring to tap into its power. Scott became Green Lantern. He went on to become a member of the Justice Society of America. Scott's ring was one weakness: wood.
Alan Scott later encountered Hal Jordan and learned about Guy Gardner. Scott and Gardner butted heads at a mixer hosted by Justice League International. They found common ground and teamed up to save Batman and Talia, who were strapped to a rocket launched by Ra's al Ghul.