In the penultimate episode of The CW’s The Flash season four, Cisco and Caitlin talked Barry into training them to use Flashtime to help take on DeVoe and rescue some hostages. Although it worked, DeVoe was one step ahead of #TeamFlash and was able to begin the Enlightenment process. The episode also found Caitlin discovering Killer Frost has been a part of her since she was a child.
Up next, season four episode 23 titled “We Are The Flash.” The season finale airs on May 22, 2018 and was directed by David McWhirter from a script by Todd Helbing and Eric Wallace.