Regenerator

One of the more resilient enemies of Resident Evil 4. Created by injecting multiple parasites into a single human, they are nigh-impervious to gunfire, regrowing any lost limb seconds after they are severed.

In order to defeat one without pumping a dozen cases of shotgun shells or a few boxes of magnum rounds into it is to equip the semi-automatic rifle with the thermal scope and pick off all parasites under the skin of the offending Plagas motel.

The scariest enemy you'll meet in Resident Evil 4.

There is also a sub-species called the 'Iron Maiden' which has spikes.

You can tell when one is coming by their ragged laughing breath.

Can only be killed with a rifle rigged with a thermal scope.

(Can be used in other senses, but im just explaining this one)

From Doctor who.

Timelords have the ability to regenerate after severe trauma or natural wear and tear. Their body will under go a complete transformation, and although the same person remains, their appearance and personality changes. (In other words, where a human would die, a Timelord would just change, thereby healing any injury in the process.)However a Timelord only has the ability to do this 13 times. (Doesnt matter much to them, in one life they Usually live to about a thousand anyway. Notice I said usually.)

This brute, abnormality can be found in Resident Evil 4. It is amoung one of the most challenging enemies in the game that is not a boss. It is able to regenerate lost limbs from weapons used by Leon, and by far the most intimidating, shocking creature. The most efficiant way to annihilate Regenerators, is to use an Infrared attachment that can be found in the lab.There is also another cast of Regenerator called the'Iron Maiden' It has erect spikes from its carcass, and can prolongate its arms, and impale Leon if caught.

Time Lords appear human, but are different. Time Lords can live for an extremely long time thanks to their ability to regenerate.

Time Lords regenerate after suffering from mortal injury, illness, or old age.

Regeneration repairs and rejuvenates all damage. But a side effect is that it changes the Time Lords physical appearance, and they gain a some what different personality.

Regeneration can be traumatic, and can leave the Time Lord disoriented, and weakened.

From doctor who:

Time lords can regenerate and have a new face and slightly different personality.

They regenerate when they are about to die, are severely ill or old age.

However a Timelord only has the ability to do this 12 times. (Doesnt matter much to them, in one life they Usually live to about a thousand anyway. Notice I said usually.) This means that they have 13 faces

See regenerative or radio