Starfox, AKA Eros, grew up on Titan alongside his brother Thanos, embracing all the pleasures that life has to offer. He later became Starfox and an official member of the Avengers. He is an adventurer and a cosmically-enhanced super-being.
Eros’ (brief) first appearance! Drax the Destroyer is telling Iron Man about Thanos, and he mentions that he has a brother named Eros, who rules Titan along with his father, Mentor. Although Eros doesn’t have a speaking role in his debut (and is very purple), he makes up for it later.
Just because Eros and Thanos are related doesn’t mean they get along! In this issue, Eros and Mentor are the last resisting force of Titan and team up with Captain Marvel. As if Thanos couldn’t be a worse brother, it is revealed in issue #33 that he killed his own mother, Sui-San. Eros, however, would get the last laugh as he, Captain Marvel, Drax, and the Avengers defeated the Cosmic Cube-powered Thanos.
Eros must have been impressed by the Avengers during their battle against Thanos because he appears in front of Avengers Mansion looking for the team! He requests membership and officially becomes an Avenger trainee, earning the codename “Starfox” in issue #232. Of course, Starfox isn’t all business. He has time to woo his teammate Jennifer Walters, AKA She-Hulk. Continue through issue #243 for his full promotion!
Starfox’s stint as an Avenger was cut short because of a space pirate named Nebula. During an attempt to capture her on Thanos’ ship, Starfox finds out that they’re related! Struck by wanderlust and wanting to know more about Nebula, Starfox leaves the team to search the cosmos. He would later find his troubled grandniece in WEST COAST AVENGERS (1985) #48 gathering large, mysterious stones from a random planet...
Starfox, Nebula, and Tryco Slatterus come looking for the one being alive who can save the universe: Thanos. Since THANOS #1, Starfox had enabled his nephew Thane, son of Thanos, in eliminating his father. But once Thane acquires an unlimited source of power in the Phoenix Force, Starfox realizes the error of his treachery.
Thanos is dead. That should be it, right? When Starfox brings his brother’s body back to his ship, he finds a will that states that Thanos will be resurrected in an unknown person. That person is believed to be Gamora, Starfox’s other niece and the main reason why Thanos is dead. So, Starfox forms a team with Gladiator, Nebula, Wraith, and Cosmic Ghost Rider to kill Gamora, and by default, stop Thanos’ resurrection.
Hela, Asgard’s Goddess of Death, reveals to the Dark Guardians that the body Thanos chose was none other than Starfox! Thanos seizes control of Starfox’s body and mind to be reunited with his own. To try to halt the process, Gamora stabs Starfox with a sword and apologizes to him. Her action doesn’t completely stop Thanos—his mind is broken—and Starfox, sadly, dies in the sixth issue.