Alienoid received praise for its ambitious scale and impressive CGI. Critics noted its unique "genre-bending" approach, though some found the dual-timeline structure complex to follow on the first watch. It remains a top recommendation for fans of Marvel-style action mixed with traditional Korean folklore.

For centuries, an alien race has been using human bodies as living prisons for their criminals, unbeknownst to humanity. Two robotic guardians, , live in the present day to monitor these prisoners. JH Wiki Collection Wiki Timeline 1: 1380–1391 A.D. (Goryeo Dynasty) The Mission