After stepping down as CEO of her dream job, Maddie heads home for the holidays to gain perspective. She finds herself running into her old high school sweetheart Carter, and tensions quickly arise. When forced to put together a Christmas dance for the local high school, Carter and Maddie find themselves putting their differences aside and rediscover what made them fall in love all those years ago.

After being struck by lightning, CSI investigator Barry Allen awakens from a nine-month coma to discover he has been granted the gift of super speed. Teaming up with S.T.A.R. Labs, Barry takes on the persona of The Flash, the Fastest Man Alive, to protect his city.