Clark is unsettled when a class project has Chloe delving into his past, and Lex has problems of his own when a man he thought long dead turns up seeking vengeance.
Mulder uncovers more clues about a government cover-up involving an alien entity and a sunken World War II aircraft. Scully pursues the man who murdered her sister.
When an art gallery that's showing potentially offensive artwork is bombed, Mulder and Scully seek some way to communicate with the comatose bomber in order to prevent a future attack.