Sam eventually arrived on Earth, though he accidentally crashed into a plane. Stunned, he crash-landed on the ground and was discovered by the Avengers (although Hawkeye mistook him for a different Nova).
Injured, all Sam could tell the Avengers was that it was coming before falling into a coma. Unknown to him, a small portion of the Phoenix Force's energy was left on his uniform, which Iron Man anaylzed and managed to confirm that the cosmic force was heading towards Earth.[2]
After he recovered from the landing, Nova joined the Avengers and the X-Men in the final battle against the Dark Phoenix, although he too couldn't help to defeat the Phoenix, his bravery allowed him to be offered with a place in the Avengers by Thor.
On his way back home, Sam was ambushed by Diamondhead, who bore a grudge against Sam's predecessor and, by association, anyone in the Nova Corps. Though Diamondhead was easily able to shrug off Sam's attacks due to him lacking the power and experience that Richard Rider had, Sam was ultimately able to fend off his aggressor by blinding him with a flash of light and leaving him stranded on a high plateau in the desert.
Personality
Sam was a disbeliever, thinking his dad's stories of being an intergalactic policeman were nothing but nonsense and subsequently viewing his dad as a loser. Despite this, he still cared for his father.
He is presumably the new Nova Prime/Nova Prime candidate after Richard Rider's supposed death.
He enjoys listening to Dubstep music and watching Sportscenter.[3]
Sam is also an apparent fan of Snickers and the Cardinals, which may be the Arizona Cardinals considering Arizona is the state he was born in.[3]
His name comes from that of Jeph Loeb's deceased son, Sam.
Sam appears to be very possessive of his Nova Corps helmet, as evidenced in AvX#1 where his last conscious thought is that they cant take off the helmet and in Marvel NOW Point One where Diamondhead's comment about taking the helmet as a trophy is what pushes him to keep on fighting.