Maltus

Maltus is the planet the Guardians of the Universe originated from previous to their move to Oa.

Maltus is home to an ancient, nearly forgotten civilization that gave birth to the race that eventually became the Guardians of the Universe over 10 billion years ago in the DC universe. Maltus is known to be an extremely overpopulated planet which serves home to a poverty-stricken humanoid race.

While advanced in technology, Maltus suffers many problems due to their overpopulation problem, as detailed in Green Lantern #81, during the Green Lantern/Green Arrow adventures of the late '70's.

In addition to the Guardians of the Universe, Maltus is also the originating planet of the Zamarons, the female counterparts to the Guardians.

Maltus was further detailed during the Millennium event, when the Gurardians and the Zamarons came to Earth to create a new race of Guardians. In Secret Origins #23, Heru (Guardian) and Nadia (Zamaron) tell the newly selected Guardians their origins.

Both the Guardians and the Zamarons eventually left Maltus to further their own agendas. The Guardians set up on the plant Oa, while the Zamarons went to a new planet and named it Zamaron.

Maltus has rarely been referred to in DC Comics due to Oa being the main base of operations for the Guardians of the Universe.