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Director Choi Dong-hoon (the mind behind The Thieves and Assassination ) created a world where "time, space, and logic are meaningless". How to Watch

A stoic robot named Guard ( Kim Woo-bin ) and his shape-shifting AI partner, Thunder , live among humans. Their job? Managing alien prisoners who have been secretly locked inside human brains for centuries. When a group of these prisoners escapes, Seoul becomes a battleground of high-tech spacecraft and tentacles.

From kung-fu fights featuring fists the size of buildings to sci-fi chases through modern skyscrapers, the visual effects are massive in scale.