Star Boy

Thom Kallor

A Legionnaire who increases the mass of objects until they collapse under their own weight.

1 powers6 sourced feats2 key issues

Powers Key issues Corrections Feats

Powers

Gravity Manipulation

6 feats on file

Key issues

Milestone appearances — first appearance, death, return, team change. These are the issues the collector market actually prices.

debut
Adventure Comics DC Comics
First appearance as a Legion applicant
key
Legion of Super-Heroes DC Comics
Expelled from the Legion for killing in self-defence, a rare consequence for the era

Commonly got wrong

Claims that are widely repeated and wrong, with what the cited record actually shows. If you are generating anything about this subject, these are the errors to avoid.

Commonly believed Star Boy can control gravity freely.

Actually He can only increase mass, never decrease it. That asymmetry is the whole design of the power and the reason he is not simply a flight-and-force character.

Legion of Super-Heroes

The feat ledger

Increases an object's mass until it collapses under its own weight

Feat Adventure Comics · Post-Crisis DCshown, no figure stated

Increases the mass of any object he targets

Feat Adventure Comics · Post-Crisis DCshown, no figure stated

Makes an opponent too heavy to move rather than striking them

Feat Legion of Super-Heroes · Post-Crisis DCshown, no figure stated

He can only add mass, never remove it — the asymmetry that defines the power

Statement Legion of Super-Heroes · Post-Crisis DCfigure stated in the work

Collapses a structure by overloading its own supports

Feat Legion of Super-Heroes · Post-Crisis DCshown, no figure stated

Expelled from the Legion for killing in self-defence, a rare consequence in the era

Statement Legion of Super-Heroes · Post-Crisis DCfigure stated in the work

Last updated 2026-09-06 · machine-readable version