Worgen are large, wolf-like humanoids reminiscent of a werewolf that walks upright, but lopes on all fours to run. According to sources held by the undead, the worgen come from another dimension, and exist only to terrorize and destroy. These creatures are thoroughly evil, delighting in torturing and devouring intelligent creatures. They enjoy hearing the screams of their victims as they tear them apart piece by piece. Worgen never show mercy or remorse. They may seem savage, but they are fairly intelligent and possess a cruel bestial cunning that can come as a surprise to the unprepared. ( )
Most worgen keep their wolf-like forms at all times, but experiments by the mage Arugal has resulted in human/worgen hybrids who only appear as worgen under the light of the moon. They carry with them a dark corrupting malaise that grows wherever they infest, making the surrounding area dark and gloomy.
Worgen are among the few humanoids that can be skinned.
Resembling a cross between human and dire wolf, the hunched over creature is roughly humanoid. Its body is covered in coarse, grayish-black fur with twitching claws and snarling teeth. The creature’s eyes are mottled yellow in color, unblinking and devoid of any discernible emotion other than hunger. ( )
Cursed beings from another dimension, worgen only appear in Azeroth as the result of magical mishaps. True aberrations, they are accidentally drawn through temporary rift tunnels and deposited in this world with no apparent way of returning. Nothing is known about the worgen’s home realm, or even precisely how to spawn the rift tunnels through which they come. ( )
Worgen are usually encountered in small packs near sites of recent intense magical activity. ( A pack may contain four to twelve individuals. ) ( A worgen tribe may contain between twenty and two hundred individuals. ) ( Fiercely territorial creatures, they rarely stray from the general vicinity of the place in which they first appeared. Fearless beasts, they brazenly prowl near both villages and monster lairs. Although worgen display an apparent fondness for nighttime and its darkness, they can perform equally well in the daytime. ) ( )
Pure killing beasts, worgen tend to attack any creatures that they encounter, regardless of whether animal, humanoid, Scourge or something even more fearsome. Strangely, however, worgen refuse to feed on the remains of their victims, preferring to shred and tear the corpses and then to return immediately to prowling. Rumors suggest that worgen somehow receive sustenance continually from their native dimension... as well as guidance from a distant force. ( )
Worgen prefer to hide in shadows before leaping great distances upon their foes. They attack with feral tenacity, slashing with their deadly claws and biting with sharp, infectious fangs. Worgen are nearly fearless and typically fight to the death, relying on their regeneration to save them.
The worgen hail from a dark and treacherous world, from which there is no corner which is truly safe. There, the worgen battle their unflinching enemy in a vicious war; the Lords of the Emerald Flame. Ur, a mage of Dalaran, did research on worgen but never summoned them. Frustrated by the destruction of Dalaran by the Scourge and against the advice of his peers, Archmage Arugal elected to summon an army of the extra-dimensional entities by using Ur's research. The summoned worgen fought against the undead armies, but quickly turned on the wizards themselves. Driven mad with guilt, Arugal adopted the worgen as his children and retreated to the newly dubbed Shadowfang Keep, where he then cursed the village people of Pyrewood to turn into worgen whenever the sun went down.
Approximately at the same time, the night elf Sentinel Velinde Starsong was given the task to clear Felwood of demons. She prayed to Elune and was granted a magical Scythe which could summon worgen. She summoned larger numbers to fight at her side against the demons. Later Velinde began to notice that some of her force were unaccounted for. It was as though the Scythe of Elune no longer required her intervention for the summoning process. So she ordered them to remain at the Shrine of Mel'Thandris in Ashenvale and began to search for Archmage Arugal, whom she had heard also summoned worgen. From that point her fate was unknown, but it was rumored that she was killed in Duskwood and lost the Scythe. Black Riders from Deadwind Pass came to Duskwood looking for the Scythe and murdered a family of farmers in the search to find it. It is also known that the dark mage Morganth was searching for the Scythe of Elune, and stole Ur's Treatise on Shadow Magic as well.
In World of Warcraft: Wrath of the Lich King, Arthas has discovered Arugal's activities and has brought him back from the dead to work for him. This also means that there are a lot of Worgen allied with the Scourge in Northrend and in particular, the Grizzly Hills. 
- Nightbane - Found in Duskwood
- Moonrage - Found in Silverpine Forest
- Terrowulf - Found in Ashenvale Forest
- Wolfcult - Found in the Grizzly Hills
- Perobas the Bloodthirster
- Apothecary Berard
- Grimson the Pale
- Odo the Blindwatcher
- Razorclaw the Butcher
- Big Bad Wolf
- Wolf Master Nandos
- Terrowulf Packlord
The worgen bear a strong resemblance to the "Myrkridia" from Bungie's Myth II: Soulblighter (a contemporary of Warcraft I and II), especially the idea of them being from another dimension.
- Tainted one
- The Book of Ur
- Jitters' Completed Journal
- Velinde's Journal
- Torment of the Worgen
- Worgen, as a playable race. on Random Ravings.