21 Jump Street — Season 4, episode 13 watch online
21 Jump Street, season 4 episode 13 «Research and Destroy»: air date January 8, 1990. Episode overview, season trailer and the cast of 21 Jump Street.
Hanson, Hoffs and Ioki try to discover who is making synthetic heroin and experimenting on people with it. Also, Ioki tries to help a Chinese student deal with a spy trying to bring him home, and Hoffs fends off an unwanted suitor.
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Episodes — Season 4
- 1 Episode 1 «Draw the Line» September 18, 1989
- 2 Episode 2 «Say It Ain't So, Pete» September 25, 1989
- 3 Episode 3 «Eternal Flame» October 2, 1989
- 4 Episode 4 «Come from the Shadows» October 9, 1989
- 5 Episode 5 «God is a Bullet» October 16, 1989
- 6 Episode 6 «Old Haunts in a New Age» October 30, 1989
- 7 Episode 7 «Out of Control» November 6, 1989
- 8 Episode 8 «Stand by Your Man» November 13, 1989
- 9 Episode 9 «Mike's P.O.V.» November 20, 1989
- 10 Episode 10 «Wheels and Deals» November 27, 1989
- 11 Episode 11 «Parental Guidance Suggested» December 4, 1989
- 12 Episode 12 «Things We Said Today» December 18, 1989
- 13 Episode 13 «Research and Destroy» January 8, 1990
- 14 Episode 14 «A Change of Heart» January 15, 1990
- 15 Episode 15 «Back from the Future» January 29, 1990
- 16 Episode 16 «2245» February 5, 1990
- 17 Episode 17 «Hi Mom» February 12, 1990
- 18 Episode 18 «Awomp-Bomp-Aloobomb, Aloop Bamboom» February 19, 1990
- 19 Episode 19 «La Bizca» February 26, 1990
- 20 Episode 20 «Last Chance High» March 19, 1990
- 21 Episode 21 «Unfinished Business» April 9, 1990
- 22 Episode 22 «Shirts and Skins» April 30, 1990
- 23 Episode 23 «How I Saved the Senator» May 7, 1990
- 24 Episode 24 «Rounding Third» May 14, 1990
- 25 Episode 25 «Everyday is Christmas» May 21, 1990
- 26 Episode 26 «Blackout» June 18, 1990