21 Jump Street is the headquarters for a squad of police officers who specialize in investigations relating to young people. Each of the Jump Street personnel was selected for his or her ability to pass for high school or college students. This would allow them to operate undercover in areas where it is difficult for regular police officers to blend in unnoticed.

--Internet Movie Database

Richard Grieco (I) -- Off. Dennis Booker
Johnny Depp -- Off. Tom Hanson
Holly Robinson Peete -- Off. Judy Hoffs
Dustin Nguyen -- Vinh Van Tran (aka Harry T. Ioki)
Steven Williams (I) -- Capt. Adam Fuller
Peter DeLuise -- Off. Doug Penhall

Harry´s friends (all 'Jump Streeters') notice that Harry is kind of out of it, and Harry explains it by informing his pals that he is a man in love. The girl he is seeing is very special to him, and she stimulates him intellectually. The guys are in disbelief, and think there is more to it than Harry lets them in on. When Harry´s girl, Bobbie (played by Bobbie), a beautiful brunette, walks in, the guys ogle her. Harry can´t believe his friends would assume she is only good for sex, just because she is shapely. During a date with Bobbie at Harry´s place, Harry is about to tell her something very personal when, Doug, his roommate, walks in. Doug apologizes for interrupting their date, and later decides to quietly watch some boxing on TV. Harry continues to tell Bobbie what he was trying to say before Doug walked in on their conversation, but by this time, Bobbie is already into the boxing match with heart and soul.