Superboy-Prime loses his powers when exposed to a red sun, as do other versions of Superman. In his first appearance, he is shown to resist the effects of red sun radiation; however, this radiation was artificial. Every time Prime has been depowered it has taken an actual red sun, and not merely localized red sun radiation. Kal-El and Kal-L defeat Superboy-Prime by flying him directly through Krypton's red sun Rao, destroying his armor and diminishing their powers in the process. Afterward, the Green Lantern Corps imprison him inside a "junior" Red Sun-Eater, which similarly depowers him. Also, unlike most versions of Superman who can store yellow solar energy to extend the use of their powers, Prime requires constant exposure to yellow sunlight to maintain his, otherwise he will depower almost instantly.