Clark is unsettled when a class project has Chloe delving into his past; Lex has problems of his own, when a man he thought long dead turns up seeking vengeance.
Laurel has a difficult decision to make after her father arrests Oliver for murder. Oliver remembers a confrontation on the island with Deathstroke.
Mulder uncovers more clues about a government cover-up involving an alien entity and a sunken WWII aircraft. Scully pursues the man who murdered her sister.
Seeking to prevent any further attacks, Mulder and Scully attempt to communicate with the comatose bomber responsible for an explosion at an art gallery showing potentially offensive work.