Origin

Cadet Marvel believed he was a military brat who was caught in an explosion of an experimental jet, absorbing energy from its fusion core. However, this was a false memory implanted by Hydra, which had trained and experimented on Cadet Marvel to turn him into a beloved superhero (resembling a sidekick of Captain Marvel) to represent a Hydra new world order. As a member of The Assembly, he would have a run in with Spider-Woman, who helped reveal the truth to him and his teammates.

Creation

Cadet Marvel debuts canonically in Web of Spider-Man (2024) one shot in a short story by Steve Foxe and Ig Guara, as a tease for their Spider-Woman series. He originally appeared on a variant cover for Captain Marvel in October 2023 drawn by Paco Medina. This cover was part of the "New Champions" variants depicting original sidekicks for Marvel's title characters.

Major Story Arcs

New Champions

After he was saved from Hydra, he was returned to his family and assembled with his former Assembly teammates as the "New Champions." When Hellrune got in over her head looking for her long lost family, she casted a spell to teleport her team to her location, however, the spell teleported additional teen heroes who also look like sidekicks who aren't.

While everyone else was fighting, Hellrune was drawn away by a voice belonging to her sorceress aunt. She was freed form her prison by Hellrune and then helped Runie tap into her magic potential ending the viking zombie horde. In the aftermath, Liberty extends membership to all the teens that were teleported there, but only a few accepted communicators for future meet ups, including Hellrune who thought she needed to stay with her newfound relative.