Eros returned to Titan to help console his cancer-stricken friend Mar-Vell when he retreated to Titan to spend his final days. Just before he died, Mar-Vell made Eros promise to take care of his Titanian companion, Elysius, after he was gone. Eros honored his vow for several weeks, until Elysius, realizing his wanderlust, released him from his promise. He left Titan and Elysius for Earth. He arrived on Earth, where he sought out and joined the Avengers as a trainee. They admitted him to their training program and the Wasp gave him the name Starfox, since they felt Eros was an inappropriate code-name. He then went on his first mission with the team, against Annihilus. He helped the Avengers vanquish the Wizard. He helped resuscitate the Vision with the help of ISAAC, and was later made a full Avenger. While on the team he had his first meeting with the Earth Eternals. Eventually, he revealed his pleasure-stimulating powers to the assembled Avengers, and helped them defeat Maelstrom. He traveled to another dimension with Spider-Man. He then helped the Avengers defeat Terminus. He battled the space pirate Nebula, and learned of her claim to be the granddaughter of Thanos. He left the Avengers with Firelord to pursue Nebula. He eventually encountered and was defeated by the Xandarian villain Supernova who blamed Nebula for the destruction of his homeworld. Eventually he found Nebula. He was held captive by Nebula, but freed himself, and assisted the Avengers and the Stranger against Nebula.