Show All Star Trek: Enterprise Star Trek Star Trek: The Next Generation Star Trek: Deep Space Nine Star Trek: Voyager Star Trek: Animated Adventures 1 - 20 of 380 sorted by 'Aliens'. Aliens Episode Acamarian TNG 157 - The Vengeance Factor Akaali ENT 009 - Civilization Akritirians VOY 147 - The Chute Al-Leyan TNG 246 - The Chase Aldean TNG 118 - When the Bough Breaks Algolians TNG 172 - Ménage à Troi Algorian mammoth DS9 442 - The Wire aliens, abducting TNG 166 - Allegiance aliens, Thed DS9 429 - Second Sight Alsaurians VOY 128 - Resistance Altorans DS9 412 - Vortex Alvanian cave sloth DS9 481 - The Sword of Kahless Amoeba TOS 048 - The Immunity Syndrome Andorians TOS 044 - Journey to Babel Angosian TNG 159 - The Hunted Antedean TNG 145 - Manhunt Antican TNG 108 - Lonely Among Us Aquans ANI 22013 - The Ambergris Element Arbazan DS9 417 - The Forsaken Argelians DS9 467 - The Die Is Cast