These are unidentified humanoids species observed in the 22nd century. (Star Trek: Enterprise)
Alien Captain
An alien captain
The Alien Captain commanded the pirate ship that attacked the Horizon, a cargo ship captained by Travis Mayweather's brother Paul. He demanded that Paul surrender and evacuate the crew. Paul at first said he would give him his cargo but not his ship. The alien captain threatened to destroy the ship. Using the new weapon upgrades that Travis had installed, they were able to cripple the pirate ship. Paul sent a meesage to the alien captain, that he better think twice before he attacked his ships again. (ENT: "Horizon")
Alien Foreman
An alien foreman
The alien foreman ran a trellium mine in the Delphic Expanse. He used an inhaler to breathe, since the toxic fumes in the mines had destroyed his lungs. Jonathan Archer wanted to interrogate a Xindi named Kessick working at the mine, but the foreman wanted a half liter of platinum in return. Archer wanted insurances that the man was a Xindi, and the foreman gave him Kessick's finger, which he had cut off. The mining colony was manned by forced labor, and the foreman wanted to capture the Enterprise's crew and use them as slave labor in the mine. After Archer failed in an attempt to rescue the Xindi, the Foreman ordered that Archer, Tucker and Kessick be killed. They were saved by the MACOs, but Kessick was killed by the foreman, who in turn was killed by a MACO. (ENT: "The Xindi")
- The Alien Foreman was played by Stephen McHattie.
Alien Head Guard
The alien head guard was under the command of the alien foreman who ran a trellium mine in the Delphic Expanse. When Archer tried to free a Xindi named Kessick, the guard captured them. He was ordered to take them to the surface and kill them. He was killed by the MACOs who rescued Archer. (ENT: "The Xindi")
Alien Merchant
An alien merchant
The alien merchant was on the Xanthan homeworld. It was home to a gigantic floating trading bazaar where the alien had a business. When Archer visited it to secure the formula for trellium-D, the merchant tried to sell him a Xanthan marmot, an animal native to the Xanthan homeworld. He told Archer that they make wonderful pets and are quite succulent when cooked properly. Archer refused the sale. (ENT: "Rajiin")
- The Alien Merchant was played by B.K. Kennelly.
Alien Prisoner
Alien prisoner
- The prisoner was portrayed by John Hansen.
Butterfly Dancers
A blue butterfly dancer
A pink butterfly dancer
The butterfly dancers were entertainers on Rigel X. They would do an exotic dance with butterflies flying around them. They would also catch the butterflies with their long tongues and eat them. Malcolm Reed was amazed by the butterfly dancers and an alien offered to introduce him to them. (ENT: "Broken Bow")
- The butterfly dancers were played by Diane and Elaine Klimaszewski.
Green-skinned alien criminal
An alien criminal
A green-skinned alien with long gray hair and a column of ridges running down the middle of his face was the leader of a band of alien criminals who were associated with Thy'lek Shran sometime in the late 2150s. Their association came to an end when the alien and his comrades wrongfully blamed Shran for stealing a Teneebian amethyst, forcing the Andorian to fake his own death in order to escape.
The alien leader ultimately learned that Shran was still alive and, in 2161, he kidnapped Shran's daughter, Talla, and threatened to kill the girl if Shran did not return the amethyst. Shran enlisted the assistance of Captain Jonathan Archer and his crew to outsmart the alien criminals and rescue Talla, who was being held on the planet Rigel X.
Shran's plan was successful, but the leader and his band were later able to board the NX-01 Enterprise, threatening Archer and his crew if Shran and his daughter were not returned to them. However, before they could harm Shran, Talla, or any of the Enterprise crew, all of the aliens were killed in a plasma explosion created by Commander Trip Tucker, who sacrificed his own life to save his captain. (ENT: "These Are the Voyages...")
- The lead alien criminal was played by Jonathan Schmock. Many believe that the alien leader and his party actually were Teneebians, although this was not established on screen.