Savitar has been the one pulling the strings, imploring his followers to bring about his return.
And what exactly does the evil duo want?
Our Christmas episode is always very tearful and emotional, executive producer Greg Berlanti says.

Credit: Katie Yu/The CW
Similarly toArrow, it sets up the threat of the back half of the year.
By the end of it, theres a whole new ticking clock that the show has.
Events will occur in episode 9 that will change the direction of the show moving forward.
The Flashs winter finale airs Tuesday at 8 p.m.
ET on The CW.