The Night of the Sedgewick Curse - S4.E4

Investigating the disappeance of a correspondent of James West's, the agents come upon a bizarre family scheme. West's associate had a rare disorder that caused rapid aging, similar to that of the Sedgewick family. In an attempt to cure the disorder, the family physician has been kidnapping people with the similar disorder and using them to test a serum he has prepared. It is up to West and Gordon to stop his tests and bring him to justice.