Sentry, whose real name is Robert Reynolds, gained his powers by ingesting an extremely potent and experimental version of the Super Soldier Serum known as the Golden Sentry Serum. This serum was designed to be far more powerful than the original serum that transformed Captain America, with strength described as equivalent to "a million exploding suns"
. The serum accelerated his molecules an instant ahead of the current timeline, granting him superhuman strength, speed, intelligence, invulnerability, enhanced senses, energy projection, flight, and vast psionic abilities. His powers are fueled by absorption of solar radiation and are dependent on his mental state, with the potential for virtually limitless power when stable
. Additionally, it is suggested that Sentry's powers are not just from the serum alone but also involve a sentient cosmic entity from another universe that merged with the serum, which contributes to his immense and sometimes reality-warping abilities
. This dual nature is reflected in his alter ego, The Void, a dark and dangerous counterpart. In summary, Sentry's powers come from taking a supercharged version of the Super Soldier Serum, enhanced by a cosmic entity, resulting in a hero with near-omnipotent abilities
