Caitlin Kimball

Caroline uses an abandoned bicycle to start a delivery service for their cupcake business, but she soon finds out that Max has never learned how to ride one.

Alicia and Paul are both offered jobs to work on Jesse Jackson's presidential campaign, but Alicia's law firm makes her an enticing offer to stay; Rainbow struggles to define her racial identity on a form.

Rainbow and Alicia struggle to fit in at school and stand out at work.

Rainbow's passion for science deflates when her peers convince her that science isn't cool; Harrison works to mould a testimony from Denise; Santamonica tries to steal the spotlight back after Johan suffers an injury.

In the wake of the Challenger tragedy, Rainbow and her family handle their grief in different ways; Denise realises that life is too short, so she vows to right all the wrongs she's done in her life.

Paul is shocked to hear from his estranged mother who wants to visit for Rainbow's 13th birthday; Rainbow sees turning 13 as a huge turning point in her life and wants a big birthday party.