Vance Astrovik, also known as Justice and formerly known as Marvel Boy, is a fictional mutant superhero in the Marvel Comics universe. He possesses the superhuman power of telekinesis. Astrovik has been affiliated with the New Warriors and The Avengers. He first appeared in Giant-Size Defenders #5 (July, 1975) and was created by Don Heck and Gerry Conway
The Vance Astrovik character in an alternate timeline became a founding member of the Guardians of the Galaxy, calling himself Vance Astro. Marvel has treated this as a separate character from the alternate Earth-691, and the two have even met on occasion.
More than a decade after his creation, Vance appeared first as a mainstay in the New Warriors and later in the third volume of the Avengers titles. He usually appeared with Firestar, who was his girlfriend then later fiancee.
In 1994, he had his own four issue limited series, Justice: Four Balance and appeared in the I (heart) Marvel: Masked Intentions oneshot in 2006.
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Official Site: Marvel Comics
Links: Wikipedia - Vance Astrovik Marvel Database Project Marvel Universe