Level 2 aliens
Aliens with long heads
In search of information regarding Klaang, Vulcan Sub-Commander T'Pol visited the trade complex Central Security office, manned by an alien with an elongated head. At least two other members of this species were also present at the trade complex and visited the burlesque show. (ENT: "Broken Bow")
Aliens with ridged brows
These two female aliens with ridged brows were seen on Level 2 outside the security office, sitting near Trip Tucker in the resting area. The first was drinking an yellow liquid from a glass jug as she waited, while the second sat holding onto a burgundy colored cylindrical case. (ENT: "Broken Bow")
Alien man 2
This alien man was talking with the third Guppi outside the Central Security office while holding a large object. Another female member of this species was present in the general vicinity. (ENT: "Broken Bow")
- See: Benzite trader
- See: Corvallen visitor
Three Guppi were seen on Rigel X in 2151.
The first was nearby when T'Pol and Trip Tucker began exploring the trade complex.
- See: Unnamed Lorillians
- See: Markalian trader
- See: Rotciv visitors
Level 5 aliens
Alien man 1
This yellow-skinned man was dressed in a maroon hood and blue frock. His flesh was mottled with brown and gray spots and he possessed no discernible nose or nostrils.
When approached by Enterprise officers Lieutenant Malcolm Reed and Ensign Travis Mayweather, the man claimed to have seen the Klingon Klaang. He persuaded Reed and Mayweather to watch the butterfly dancers' show and even offered to introduce them. The Humans declined. (ENT: "Broken Bow")
Both women were nearly identical with one primarily blue in color, the other mostly pink. Their faces were white above the mouth and their hair matched their colorful skin tone. The dancers' bodies were covered in silver-colored objects. Another alien claimed to know the dancers personally and offered to introduce them to Reed and Mayweather. (ENT: "Broken Bow")
Shran's former associates
Sometime in the late 2150s, Andorian Thy'lek Shran was forced to fake his death, wrongfully accused by at least four alien criminals of stealing a Tenebian amethyst. Learning of this deception in 2161, the criminals kidnapped Shran's daughter, Talla, threatening to kill her if Shran did not return the amethyst.
With the help of Captain Jonathan Archer and the crew of Enterprise, Shran confronted the aliens on Rigel X, retrieving Talla and escaping. The alien gangsters, however, were able to catch up with the NX-01 and board the ship. Before they could harm Shran, Talla, or any of the Enterprise crew, all of the aliens were killed in a plasma explosion set off by Charles Tucker III, who was also fatally wounded. (ENT: "These Are the Voyages...")
The lead alien of the gang was an ashen-green-skinned alien with long, gray hair. His features were distinguished by a column of horizontal ridges bisecting his face. He had pale blue eyes and was dressed in a gray, padded suit with a sash-like belt.
A second green-skinned alien was also a part of the gang, and was present when the criminals boarded Enterprise. He wore a long red coat and carried an alien phaser rifle. (ENT: "These Are the Voyages...")
Among the alien gangsters associated with Shran was a semi-reptilian man, characterized by brown, scaled skin. The alien's features were dominated by distinct cheekbones and several sharp horns extending from the middle of his forehead to the back of his head. His hands were heavily scaled and he wore a brown, hairy-looking jacket. This alien also carried an alien phaser rifle. (ENT: "These Are the Voyages...")
The fourth alien criminal killed aboard Enterprise was another humanoid, this one orange in color with a red face. His face was also distinguished by dominate cheekbones and he had large, slanted nostrils. His hands were clawed, his hair brown and long. This alien was dressed in a camouflage-green suit with a gray and rust-colored belt. (ENT: "These Are the Voyages...")
Two actresses, Angela Giampietro and Erika Mueller, both appeared in the Rigel X scenes in "Broken Bow", portraying as-yet unidentified characters. Yvonne Carlson, Kitty DeCarlo, and Heather Ettinger are listed on the call sheet as "Female Alien C".
In the deleted scene 092 from "Broken Bow", Captain Archer and Hoshi Sato had a conversation with the dockmaster of Rigel X while searching for the Klingon Klaang, played by actor David Richards who later portrayed a Markalian dockmaster in the second season episode "The Seventh".
This scene featured two more background performers as Rigel natives. The deleted scene was later added to the ENT Season 1 DVD and he also appeared in the novelization.
The call sheets for the episode list Richards as "Dock Master" and the two background actors as "Rigel (New and improved)". The scene was filmed on 4 June 2001 on Paramount Stage 8 including work in front of a green screen. One of the two background costumes was later sold off on the It's A Wrap! sale and auction on eBay. 
Deleted Scene 099 from "Broken Bow" featured an alien fire eater on Rigel X, portrayed by professional fire eater Debra Lamb Bailleaux.