The past comes back to haunt both Oliver (Stephen Amell) and Laurel (Katie Cassidy). Curtis (Echo Kellum) is upset when he discovers that Diggle (David Ramsey) and Lyla (guest star Audrey Marie Anderson) have restarted The Ghost Initiative with Diaz (guest star Kirk Acevedo), China White (guest star Kelly Hu), Kane Wolfman (guest star Liam Hall) and Carrie Cutter (guest star Amy Gumenick).