Sezhyr was an Ice Warrior and a legendary warlord of his people.
Sezhyr became one of the first marshals of the Ice Army during the Dust Rebellion. Sezhyr ended the rebellion by slaying the leader of the Dust Riders, which secured him as one of his people's greatest leaders. Sezhyr designed a device known as the Orb of Alikyr, which would contain his essence and seek out those with a human physiology and replace the host consciousness with that of Sezhyr, which it did with Raina Kerenskaya. In 1967, Sezhyr was resurrected when Rain Kerenskaya put his helmet on. Sezhyr was disgusted to learn that the group of Ice Warriors who had resurrected him were hiding from the humans, and later planned to return to Mars, resurrect the ice army and conquer Earth. Sezhyr was finally killed when Ace destroyed the Orb of Alkyr (TV: Thin Ice)