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Travels a hemisphere in a few seconds and blitzes a Phoenix-powered Cyclops
Avengers vs. X-Men #12
Blew up a giant death robot with the wires of a celestial’s head charged with the Nova Force
Nova (2013) #14
He managed to beat Kluh, described as “The Hulk’s Hulk” and “even bigger and meaner,” with a broken helmet, serious bodily injuries and a concussion.
Nova (2013) #23-#24
He was able to rush Captain Marvel and knock her to the ground
Champions (2016) #21
Nova’s helmet was tricked out to be able to feed off an antimatter sun. Later, Sam was able to disable Annihilus’ Blackstar weapon (which had the power to punch a hole in the universe) by blasting it with positron energy.
ANAD Avengers (2015) #11-#12
So there’s been Young Avengers, various young X-Men teams, the Future Foundation kids, Strange Academy, etc. Who’d be on your Young Guardians roster?