Here’s the extended trailer for next week’s episode of The Flash, titled “We Are The Flash”. It’s the finale for the show’s fourth season.
And here’s the official synopsis for the episode, which seems to be keeping details deliberately vague.
“We Are The Flash”
SEASON FINALE — Team Flash gets help from a surprising ally in their battle against DeVoe (Neil Sandilands). David McWhirter directed the episode written by Todd Helbing & Eric Wallace (#423). Original airdate 5/22/2018.
We’re promised the answer to a few mysteries in the episode. What do you hope to see in it?

This is the story of two people who wore lighting bolts…both of whom were largely forgotten for a time. One has just been reunited with his Aunt Iris. The other? Well, the other is getting his groove back on as well…and this is really HIS story. It echoes back to FLASH: REBIRTH, and gets us ready for FLASH WAR! Want to know more? Follow us after the jump!