When several research scientists are found frozen to death, Mulder and Scully being to suspect the murders may have been committed by a time traveler from the future.
When Sisko's crew crashes on a desolate planet, they find marooned Jem'Hadar warriors suffering withdrawal from ketracel-white.
Jarod becomes a counterfeiter and an undercover policeman in order to crack a Chicago crime syndicate; Miss Parker receives a difficult order.