Enhanced Undead

Enhanced Undead, alternatively called Super Undead, are creatures that appeared in the film Resident Evil: Extinction. These were a superior breed of Undead created by Dr. Alexander Isaacs in a failed attempt to domesticate the Undead and use them as a slave labour force.

History
During the Global T-Virus Pandemic, Dr. Isaacs (actually a clone of the real Isaacs) conducted numerous experiments on the Undead in an attempt to domesticate them. While Umbrella knew that the creatures would never be human again, they saw potential use in them as a labour force for when Umbrella retook the planet in the wake of the pandemic. Isaacs developed a compound derived from the blood of Alice, who had previously been infected with the T-Virus and had adapted it to her genetic makeup. This compound was injected into numerous Undead test subjects and, for a brief period, the subjects actually regained a small degree of intelligence, demonstrating child-level problem-solving capabilities and recognising familiar objects. However, these effects did not last and the zombies soon returned to their aggressive, hungry state, but were now stronger than before and capable of running after prey whereas they could only walk awkwardly before.

Though his attempts at domestication had failed, Dr. Isaacs put the enhanced Undead to use in hunting down Alice and a group of survivors led by Claire Redfield. After tracking Alice to the buried ruins of Las Vegas, Isaacs had a cargo container filled with zombies air-dropped in front of the survivors' convoy. The container was opened remotely and the enhanced zombies poured out, attacking everyone in the vicinity. Though the zombies were faster and more ferocious than before, the survivors were able to eventually kill them all, though not without suffering heavy losses.

Abilities
The Super Undead, while retaining a mindless (and unnecessary) hunger for human flesh like the regular undead, displayed a significant increase in their intelligence. The original specimen demonstrated some rudimentary reasoning skills by placing differently-shaped blocks into the corresponding holes. It also displayed memory, correctly demonstrating the use of a cellular phone, digital camera, and one Super Undead tried picking up a chair to smash it against the bulletproof glass of its cell to escape when it got angry. However, once they get angry, they lose control and revert to their mindless, aggressive state. They are also stronger than regular zombies, as they were able to break free from the restraints that presumably would have held a regular zombie. Also, it seems that they could feel pain and exhibit emotion.

The jump in their intelligence was accompanied by an increase in the potency of the Undead's viral loads. Dr. Isaacs was bitten by one and still retained the T-virus infection even after a massive dose of the anti-virus, which eventually led him to mutate into his Tyrant state.