# Gim Allon

Gim Allon, also known as Colossal Boy, Leviathan, and Micro Lad, is a superhero appearing in books published by DC Comics, primarily as a member of the Legion of Super-Heroes in the 30th and 31st centuries. Created by writer Jerry Siegel and artist Jim Mooney, the character first appeared in Action Comics #267 (August 1960).
He has gone by a variety of superhero names over the past several decades, although Colossal Boy is the first and most common. His name's similarity to the Israeli surname Allon led writer Paul Levitz to identify the character as Jewish in 1980.
In the 1990s, the entirety of the Legion of Super-Heroes were changed in what is referred to as a "reboot" of those characters' continuity, including Allon. Later on, these superheroes were again rebooted in what has been referred to as the "Threeboot".

## Fictional character biography
### Original continuity

Gim Allon is a human who gains the ability to increase his size after being exposed to a radioactive meteorite. With his parents' blessing, he joins the Legion of Super-Heroes as Colossal Boy. He has an unreciprocated crush on fellow Legionnaire Shrinking Violet, and the two eventually marry. For a time, Colossal Boy's mother Marte is President of Earth.
During the "Five Year Gap" following the Magic Wars, Colossal Boy joins the Science Police as Earth falls under the control of the Dominators and withdraws from the United Planets. Amidst this, "Batch SW6", temporal clones of the Legionnaires, escape the Dominators' captivity.

### 1994 reboot

Following Zero Hour: Crisis in Time!, which rebooted the Legion's continuity, Gim Allon is known as Leviathan and originates from a Martian colony. He is the Legion's first leader, but resigns after one mission in favor of Cosmic Boy and becomes deputy leader. Allon is later killed in battle with Doctor Regulus, with Shrinking Violet gaining his powers.

### 2004 reboot

In the "Threeboot", Gim Allon's species is created by Bizarro Brainiac. They are normally giant-sized and can shrink down to human size.

### Post-Infinite Crisis

The events of Infinite Crisis restore a close analogue of the pre-Crisis Legion to continuity, as seen in "The Lightning Saga" story arc in Justice League of America and Justice Society of America, and in the "Superman and the Legion of Super-Heroes" story arc in Action Comics. Colossal Boy is included in their number, along with his wife Yera Allon.
In Doomsday Clock, Colossal Boy is erased from existence when Doctor Manhattan alters the timeline. However, he is restored when Superman convinces Manhattan to undo his actions.

### The New Golden Age

In The New Golden Age, Colossal Boy is among the Legionnaires who arrive in the present and confront the Justice Society over their decision to recruit Legionnaire, a young, heroic incarnation of Mordru.

## Powers and abilities

As Colossal Boy or Leviathan, Gim Allon can increase his size into many times normal height, with strength proportionate in mass. He additionally possesses expertise in law enforcement. In the 2004 reboot of the Legion of Super-Heroes, he is giant-sized normally and can shrink down to six feet tall.
As a member of the Legion of Super-Heroes, Gim Allon is provided a Legion Flight Ring, which allows him to fly and survive in the vacuum of space and other dangerous environments. Brainiac 5 modified his ring so it would enlarge with him, thus supporting the additional mass.

## In other media
### Television

* Gim Allon as Colossal Boy makes a non-speaking cameo appearance in the Justice League Unlimited episode "Far From Home".
* Gim Allon as Colossal Boy appears in Legion of Super Heroes, voiced by Adam Wylie.

### Video games

Gim Allon as Colossal Boy appears as a character summon in Scribblenauts Unmasked: A DC Comics Adventure.

### Miscellaneous

* Gim Allon as Colossal Boy appears in Batman '66 Meets the Legion of Super-Heroes.
* Gim Allon as Colossal Boy appears in Teen Titans Go! #25.