Alpha Shapeshifter

The alpha shapeshifter was the very first shapeshifter and the one who spawned all the others.

Early Life
It was the first shapeshifter created by Eve. Its age remains unclear, but as the stories of its children are around thousands of years old, it is likely the alpha has been alive since its mother last walked the earth, ten thousand years ago.

Season 6
In "Two And A Half Men", this shapeshifter starts gathering a following of its 'offspring' and is apparently reproducing with women by morphing into their husbands. When Sam and Dean rescue one of its children, the Alpha Shapeshifter storms the Campbell's compound and kills Mark Campbell, overcoming several gunshot wounds and tranquilizer darts, as well as a silver knife to the heart. This shapeshifter is able to transform in just a few seconds without shedding its skin. It then takes the baby from Dean, but doesn't kill him.

In "Caged Heat", Crowley has captured the Alpha Shapeshifter who takes on the form of Crowley himself and is held in Crowley's Monster Prison. Crowley tortures the Alpha Shapeshifter on the location of Purgatory with no luck. Crowley reveals that through torture on lesser shapeshifters, he has discovered that iridium is painful to them despite how outrageously expensive it is. Crowley tortures the Alpha Shapeshifter with an iridium knife, but he refuses to break. Next, Crowley reveals that he has multiple shapeshifter children held captive in the prison and threatens to kill them in front of the Alpha Shapeshifter. After a moment, the Alpha Shapeshifter tells Crowley to go ahead as the shapeshifters will just make more. Enraged, Crowley snatches a machete and decapitates the Alpha Shapeshifter, killing him. Standing near the Alpha Shapeshifter's headless body, still in the form of Crowley, Crowley jokes that "I guess I kind of lost my head."

Powers and Abilities
The alpha shapeshifter has all the traits and abilities of normal shapeshifters, although at unbelievable levels. It also has several unique powers, which come with being an alpha.
 * Shapeshifting - It can morph its body to match any human appearance. Unlike the majority of its children, it does not shed or peel off its skin while altering its shape. It can change its form in seconds and it can also copy clothing. Its shapeshifting ability was such that it was akin to the shapeshifting of stronger beings like Eve and the leviathans.
 * Superhuman Strength - Its strength is monumental compared to that of all other shapeshifters, being able to overpower four hunters simultaneously, lift a grown man into the air with one hand, and rip a solid iron door off its hinges. He was also able to choke Dean to near unconsciousness. Sb.gif
 * Regeneration - Able to heal wounds caused by knives and bullets incredibly quickly.
 * Immortality - It can live forever, provided it isn't killed by decapitation or iridium.

Alpha Abilities

 * Superhuman Stamina - Its durability and threshold for pain are extremely high, being only susceptible to iridium, though decapitation works too. According to Samuel, the alpha merely chuckled when shot with an elephant tranquilizer.
 * Immunity - Unlike lesser shapeshifters, the alpha is immune to silver.
 * Telepathy - Like all alphas, he has a telepathic link to its children, thus allowing him to locate them, regardless of where they are.

Weaknesses
As one of the Alphas, the Alpha Shapeshifter has very few weaknesses, including being invulnerable to many regular shapeshifter weaknesses.
 * Iridium - One of the few things known to be harmful to the Alpha Shapeshifter. Being stabbed with an iridium knife was very painful to him.
 * Decapitation  - Crowley was able to kill the Alpha Shapeshifter through decapitation.
 * The Colt - Can kill all but five things in existence. The Alphas are vulnerable to the Colt as seen when Sam Winchester used it to kill the Alpha Vampire.

Appearances

 * Season 6
 * Two And A Half Men
 *  Caged Heat

Trivia

 * The alpha shapeshifter is the first alpha to be killed in the series. It was the only alpha to be killed on-screen before Sam Winchester killed the Alpha Vampire with the Colt in The Raid.
 * A few of the Alpha Shapeshifter's children are shown to share its ability to change form seamlessly. These shapeshifters include the Lassiter Family and Magnus' Shapeshifter. The reason they are different from the others is not stated.