The CW has released the Arrow episode synopsis for the second appearance of Grant Gustin as The Flash in "Three Ghosts."
It's been reported that following this episode, Grant Gustin will be seen in his own pilot in The Flash for the first time in full costume.
Arrow airs Wednesdays at 8pm ET on the CW.
OLIVER IS VISITED BY GHOSTS FROM THE PAST — After a fight with Cyrus Gold AKA the Acolyte (guest star Graham Shiels), Oliver (Stephen Amell) is drugged and left for dead. Determined to cure him, Felicity (Emily Bett Rickards) makes a risky decision. The cure causes Oliver to hallucinate, and what he sees forces him to confront his past. Meanwhile, Barry (guest star Grant Gustin) continues to help Felicity, and their connection grows stronger. The Arrow asks Lance (Paul Blackthorne) to look into Gold, but when the stakeout on Gold goes bad, someone is killed. Roy (Colton Haynes) is captured and tortured by Brother Blood (guest star Kevin Alejandro). John Behring directed the episode with story by Greg Berlanti & Andrew Kresiberg and teleplay by Geoff Johns & Ben Sokolowski (#209).