Zombies are undead beings created through the reanimation of a human corpse appearing in The Mummy. They are the servants of Ahmanet and Set and appear to have some if not all of their recollections from their past lives.
It should be noted that unlike most versions which are a result of science or a disease, these were lifeless corpses that were brought back through dark magic which may explain why their superior intelligence and strength.
It is currently unknown if there is more then one type of Zombie.
The Zombies first appear when Ahmanet is released from her sarcophagus after the plane crash. Still physically weak from her mummification, she starts sucking the lifeforce from people to regain her lost powers. She then uses her powers to reanimate them as undead muscle which she uses to attack Nick and Jenny several times throughout the movie.