The Joseph Martin version of the
Atomic Skull appears in
Justice League Unlimited voiced by Lex Lang. He first appears in
"The Cat and the Canary" as
Wildcat's main opponent at Roulette's Meta-Brawl until
Green Arrow and
Black Canary interrupted the match. In
"I Am Legion," Atomic Skull later returns as a member of
Gorilla Grodd's Secret Society.
In the episodes
"Alive" and
"Destroyer," he sides with
Luthor during the mutiny during the two-part series finale. He is found among the survivors of
Darkseid's attack. He and
Luthor insist that the surviving villains help the heroes during the defense of Earth against the forces of
Apokolips. He fights alongside
Hawkgirl and
Commander Steel in Washington DC. He is last seen taking advantage of the "five-minute head start" the Justice League grants the surviving villains at the end of the final episode (notably he is the one who vocally opposes being arrested after helping save the world from
Darkseid's forces).
Atomic Skull appears in the
Young Justice episode "
Revelation." He is seen as a member of the
Injustice League.
* 
