When Blitzen announces his retirement on December 21st, a miniature horse has 3 days to fulfill his lifelong dream of earning a spot on Santa's team at the North Pole try-outs.

X战警被分散到了各个时间线，从过去，到未来，而他们将在最脆弱的时间点遭遇袭击——如今，1990年代。天启发威，大战来临。