If Bleeding Cool has this right here is some back story to Stallone's character Starhawk:
As an adventurer and protector, Starhawk revealed himself to the Guardians of the Galaxy and the Defenders in the year 3014. He aided them in overthrowing the Badoon occupation of Earth.
Starhawk joined the Guardians of the Galaxy in a space mission, and helped defeat the Topographical Man.
It is later revealed he manipulated events to bring the Guardians together; for example, when Charlie-27 teleported from Jupiter to escape the Badoon, Starhawk caused him to be transported to Pluto where he met Martinex.
During this time, Stakar's three children (Tara, John and Sita) were changed into energy vampires by Aleta's father and sent to kill Stakar. They died of accelerated old age. Aleta thereafter blamed Stakar (rather than her father) for the deaths of their children, and their relationship never recovered.
Starhawk teamed with the time-traveling Thor, and battled Korvac and his Minions of Menace.Starhawk later traveled to the 1970s alongside his fellow Guardians, and assisted the Avengers in battle against Korvac. Alongside the Guardians, the Fantastic Four, Dargo, and Kreeper Starhawk battled manifestations of Korvac's power in various eras.
In 3017, Starhawk accompanied the Guardians on a quest to find the lost shield of Captain America. He battled Taserface and the Stark, and was physically separated from Aleta in an accident. Aleta was the stronger of the pair, and Stakar forcibly reabsorbed her to sustain himself. The two struggled for dominance of their physical space, and Stakar metemorphosed into a 'dark' version of himself, projecting 'black light'.
Because of Stakar's assault on their teammate, the Guardians chose to expel him from the team. Eventually, Aleta became dominant, and reverted Stakar's body to an infant state. Aware of his destiny, she sent him back in time to begin his life cycle again.