As a child,Garfield Logan contracted with a rare illness called Sakutia and was cured by a serum from a green monkey. This serum had the unintended effect of turning his skin and hair green and gave him the ability to change into any animal form. Whatever team he is part of, he likes to joke around with people and make jokes of the situations the team get themselves into. However, this is only a facade. In reality, Beast Boy is a boy who has suffered many hardships in his life.