Bio: When Felix Faust discovered the truth about Lord Hades and
his imprisonment, he felt that it was his duty to set him free. After
all, with his master being free, he would gain what he had wanted all
along: ultimate knowledge. Of course, once Hades got out, he betrayed
Faust and turned him to dust.
He unleashed his army of the dead onto the Justice League while
Hippolyta and Wonder Woman fought him. While it was in vain at first,
once Faust conjured up his last bit of energy and tossed it at Hades, he
revealed his true form and things were set into motion. Wonder Woman
removed the key from its slot and the gates began to close again,
sucking everything in the room into it. While Wonder Woman held onto her
mother for dear life, Hades latched on, but was beaten off at the last
moment. Then Wonder Woman pulled herself and her mother to safety.
For more, refer to the Justice League Unlimited bio.