Marvel
refers to Spartan in the world of Doom 2099. It reads:
...Doom
later fought a pair of strange foes. First, was the
resurrected patriarch of the future nation of Wakanda,
a king named Thandaza, whose granddaughter, Princess
Okusana, rebuilt in a cyborg body to avoid the pressures
of leadership. Doom finally defeated Thandaza, returning
him to a grateful death, but not before plugging in
and ransacking Wakanda of its technology, including
the design of their Environmental Maintenance Platforms
that kept its air clean of pollutants. Next, he fought
an ancient being known as Necrotek, who was once defeated
by the three Eyes of Agamotto, in the hands of Caius
the Spartan. With the help of the gypsy’s young
adept, Vox, and his single Eye of Agamotto, Doom banished
Necrotek with a Caius Circle drawn in cyberspace,
where Necrotek had anchored himself, using information
Doom found in a hidden library of mystical texts...
