Mission: Impossible - Season 3 - Eps 14: The Test Case
A scientist of an enemy power, Dr. Oswald Beck, has developed a bacteria which causes cerebral spinal meningitis and mutated it into a form that kills and then becomes inert after a few hours. The IMF must destroy the preliminary culture and stop Beck. Rollin replaces the prisoner chosen for a test of Beck's bacteria, and Barney switches the bacteria cylinder for one with knockout gas and then uses a balloon to capture the gas. Rollin ""dies"" but then Jim, who has infiltrated the base as a military medic, ""discovers"" that Rollin isn't dead. Meanwhile, Barney releases the knockout gas into the control room, knocking out Beck's superiors. Beck thinks they are dying from his bacteria and believes they'll think he's a traitor who tried to kill them rather than the test subject. He flees but is shot while Jim destroys the bacteria.
About Mission: Impossible

Title: Mission: Impossible
First Air Date: 1966-09-17
Last Air Date: 1973-03-30
Status: Ended
Rating: 7.6/10 (from 278 votes)
Language: EN
Seasons: 7
Total Episodes: 171
Network: CBS
Genres: Action & Adventure, Crime, Drama
Production Companies: Desilu Productions, Paramount Television
Synopsis
Mission: Impossible is an American television series that was created and initially produced by Bruce Geller. It chronicles the missions of a team of secret government agents known as the Impossible Missions Force. In the first season, the team is led by Dan Briggs, played by Steven Hill; Jim Phelps, played by Peter Graves, takes charge for the remaining seasons. A hallmark of the series shows Briggs or Phelps receiving his instructions on a recording that then self-destructs, followed by the theme music composed by Lalo Schifrin. The series aired on the CBS network from September 1966 to March 1973, then returned to television for two seasons on ABC, from 1988 to 1990, retaining only Graves in the cast. It later inspired a popular series of theatrical motion pictures starring Tom Cruise, beginning in 1996.
Cast

Peter Graves
Jim Phelps

Greg Morris
Barney Collier

Peter Lupus
Willy Armitage

Lynda Day George
Dana Lambert

Bob Johnson
Man on Tape (voice)