Colossal Boy
Colossal Boy

Real Name

Gim Allon






Legion of Superheroes, Science Police

Abilities and Powers

Size Shifting

First Appearance

Timber Wolf

Voiced By

Adam Wylie



Colossal Boy aka Gim Allon, of Earth, was once a Science Police cadet. When he took a vacation on Mars with fellow cadet and girlfriend, Gigi Cusimano, things changed. While sand-skiing, Allon was hit by a radioactive meteor. He thought nothing of it but was transferred to the Science Police Academy Infirmary. Some time later, Allon spotted a crime in the making and pursued the criminal. The criminal escaped in an elevator but Allon caught him by growing to a height of 15 feet.

His mother, Mrs. Allon, implored him to use his new powers in the Legion of Superheroes rather than the Science Police. He joined as Colossal Boy and was nicknamed "CB2" by Cosmic Boy because they shared the same codename initials. Colossal Boy's strict work ethic transferred over at the Legion. Always on patrol, Colossal Boy is often somewhere in space.

Man of TomorrowEdit

When the Fatal Five escaped prison, he was on Braal and was unable to return and protect Legion Headquarters.

Lightning StormEdit

Even after he and the Legion were drenched in Space Squid ink, Colossal Boy returned to patrol.

Timber WolfEdit

Colossal Boy witnessed Timber Wolf's initiation into the Legion via video screen.

The SubstitutesEdit

He worked with the Legion battling creatures who had began attacking the ionosphere.

Chain of CommandEdit

Colossal Boy took part in the Legion leadership vote which eventually went to Bouncing Boy.


He was among the Legionaries when the battled the Controller, who had released the deadly weapon the Sun-Eater.

The Man from the Edge of TomorrowEdit

He and the Legion go to take down the escape prisoner on Takron-Galtos. But are themselves locked up in the cells, until released by the rest of the Legion.

Cry WolfEdit

He was among the Legionaries when they tried to bring the rogue Timber Wolf in for the murder of his own father. But Timber Wolf eventually proves his own innocence.

The Karate KidEdit

He witnessed Karate Kid's initiation into the Legion via video screen.

In the BeginningEdit

He was among the Legionaries as they celebrated the anniversary of the formation of the Legion of Superheroes.

Dark VictoryEdit

He was among the Legionaries who fought in the final stand against Brainiac 1.0.


As Colossal Boy he could increase his size to many times the height of a human, with proportionate increases in strength and mass.


  • Legion Flight Ring: Like all Legionaries Colossal Boy wears a flight ring. It allows him self propelled flight and protection in the vacuum of space.


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