Question: what movies are coming out on december 21?
Answer: Aquaman. Aquaman is the king of Atlantis, born half-human as Arthur Curry and half-Atlantean. ... 
Bumblebee. On the run in the year 1987, Bumblebee finds refuge in a junkyard in a small Californian beach town. ... 
Welcome to Marwen. ... 
Second Act. ... 
Bird Box. ... 
105 mins. ... 
Between Worlds. ... 
Cold War.