A teen's pregnancy sensitizes Guber; a gang slaying deeply affects Kimberly and her prize student; romantic liaisons have differing impacts on Ronnie and Hanson.

Kimberly is stalked by one of her students; Lipschultz celebrates Valentine's Day with Guber's mother.

Hanson's troubled sister drops off her 4-year-old daughter for him to watch; Marylin urges Aisha to stand up to her boyfriend; Ronnie and Marla vie for the position of assistant principal.

Tensions surface over Ronnie's new post; Aisha's participation in the school musical and her relationship with J.T.; Harvey's required recertification; and Danny's care for his niece.

Courtroom drama energizes Ronnie, who's defending two teens in a murder arraignment; high test scores by poor students prompt Guber's undercover investigation.

Aisha's ailing father leaves a song manuscript in her possession, and she writes lyrics for the melody.

Hanson asks Claire to marry him; a student uses rap music to critique Shakespeare; a producer pushes Aisha to sign a record deal; Lifehouse performs at Doyle's Bar.

A student writes a letter to Whitney Houston asking her to attend the prom with him; Harper tries to prevent teachers from being fired for budgetary reasons; Danny asks Claire's father for permission to marry her.

An enraged student slaps Marla's face in front of the class, and Marla slaps her back; Hanson discovers Allison behaves like a bully at school; Carmen asks Harper to remove Jake from her class.

A student discovers Harper and Marilyn have been secretly dating and threatens to go to the school board; Hanson and Claire try to assist a student who is having trouble with his dad.

Harper decides to call the FBI when he learns that a student has been accessing a terrorist recruitment web site from the school library; Ronnie learns that one of her students has HIV.

Guber contends with a student who thinks he is Jesus and is using school funds to feed the homeless; Marla mistakenly books R.E.M. for a school fund-raiser.

Henry gives bad advice to a brainiac student who wants to become an artist; Marla has a miscarriage; Rainy is thrown out of her foster home.

Ronnie catches a male teacher hugging a female student; Hanson worries that he may be a control freak following an incident in his Drivers' Education class; several students are caught photographing themselves nude with only words written across their bodies.