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An Alien Conquest alien.

An Alien is a being not originally from Earth. In LEGO sets, some have been evil and some have been good. Aliens have appeared in mostly Space sets. Physical Alien minifigures first came in the 1997 theme UFO, and the following year with Insectoids, and have been in every Space theme since.

List of notable aliens

UFO (1996 - 1999)
Insectoids (1998 - 1999)
Rock Raiders (1999 - 2000)
Arctic (2000)
Life on Mars (2001 - 2002)

(Also known as Martians)

Xalax (2001)

(Also known as Ramas)

Mars Mission (2007 - 2009)
Space Police III (2009 - 2010)
Toy Story and Toy Story 3 (2010)
Collectable Minifigures (2011-2021)
Alien Conquest (2011)
LEGO Games (2010)

LEGO Rock Band (2009)

Vidiyo (2021-present)
Unreleased Aliens