Eclipse (aka Alejandro Luna) is a cosmically powered teen with energy projection and manipulation powers of unknown extent. He is a participant in the PRIME SUMMER PROGRAM and helped the team defeat the Antediluvian on both occasions they faced the entity. Alejandro had a hard time relating to his fellow students, but eventually he forged a bond with Jack Flash and Joule during their plane ride back from Amsterdam, and he and Jack Flash shared some Mediterranean food in the ruined parking lot of the Parthenon, a generic Mediterranean restaurant that was the site of their final confrontation with the Antediluvian. During that episode, it appeared that he and Jack Flash formed a stronger bond, if for no other reason than they had both lost a little patience with their fellow team members Vector and Joule.
Eclipse is not to be confused with Eclipse (II), also known as Shadow Boxer.