Caitlin Kimball

When a bicycle is abandoned outside the serving hatch of the cupcake business, Caroline takes possession of it in order to start a delivery service. But her plan goes awry when it becomes clear that Max has never learned how to ride a bike.

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.

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.

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.

When Rainbow is tasked with a school assignment that requires her to trace her roots, she learns that history is more complicated for her mum's side of the family than it is for her dad's.