Name: Colossal Boy
Universe: Earth-1
Alter Ego: Gim Allon
Occupation: Legionnaire
Marital Status: Married
Group Affiliation: Legion of Super-Heroes
Base of Operations: 30th Century Earth
Known Relatives: Marte Allon (mother), Wynn Allon (father), Yera (wife)
Height: 6 ft. 2 in.
Weight: 200 lbs.
Hair Color: Brown
Eye Color: Brown
First Appearance: Adventure Comics #267

History:
Gim Allon was on vacation from the Science Police Training Academy in the latter half of the 30th Century when a strange meteor crashed into the Martian soil near him. The meteor's radiation altered his body's RNA, giving him the power to grow to a variety of giant sizes at will.

Gim's family convinced him to use his new powers in the cause of justice, and he joined the Legion of Super-Heroes as an early member. For a long time Gim had a crush on fellow member Shrinking Violet that was not reciprocated, but when a Durlan actress infiltrated the LSH disguised as Violet, Gim married her. When the true identity of Yera (the Durlan's stage name) was revealed, Gim realized he had fallen in love with her, and reaffirmed their marriage.

For several years Gim's mother, Marte, served as elected President of Earth and a member of the United Planets Council. She has now returned to Metropolis University's political science faculty.

Powers:
Gim Allon has the ability to enlarge his body proportionately, effectively growing to sizes from his normal height to heights of ten or twenty-five feet, for example. The precise limitations on this power have not been established, nor the exact extent to which his strength increases with size, and apparent side effect of the growth.

As a Legionnaire, Gim has completed personal combat training and wears the LSH flight ring to fly. With his additional combat training from his studies with the Science Police, his is one of the most skilled hand-to-hand combatants in the LSH.