The original Javelin was Darin, a first generation Spaceknight. He was a famous Galadorian athlete particularly skilled at spear-throwing. When converted into a Spaceknight, Darin was given a plandarium javelin, able to shoot darts at enemies. He was among the Spaceknights trapped by Mentus the sorcerer until Rom rescued them. He later joined Rom and others against Galactus. His javelin proved resistant to the cosmic axe of Terrax which failed to cut through it. His status is uncertain.
The third Firefall was Darin the Younger, a Galadorian youth recruited as a third generation Spaceknight. This generation included two sons of Rom and Starshine/Brandy Clark and various Galadorian youths originating in Galador's space colonies. The colonies had not been affected by the civil war which annihilated the previous inhabitants of Galador. He might be related to the previous Darin. He also used a plandanium javelin. The main difference of these Spaceknights was that they could change between cyborg and human form at will. The first two generations could only regularly use the cyborg form, their human form was placed in suspended animation to await their returns.