It’s the first-ever nationally recognized Dr. Martin Luther King Jr. Day and Paul is speaking at the school assembly about his personal experiences with him. Johan and Santamonica think Paul is going to embarrass them; and being ashamed of her father had never occurred to Rainbow, so they decide to ditch. Meanwhile, Alicia thought she had convinced Harrison to take pro bono civil rights cases on MLK Day to honor him, but he plans to go golfing instead, so Denise steps in to help.

Paul is shocked to hear from his estranged mother who wants to visit for Rainbow’s 13th birthday and soon learns more about why she abandoned him. Meanwhile, Rainbow sees turning 13 as a huge turning point in her life and wants a big birthday party, but Alicia wants to celebrate all the things Rainbow missed out on over the years while on the commune.

After learning that scientists predict the ozone layer will be depleted in 20 years, Rainbow panics and tries to implement Earth Day at school to influence some change. To her surprise, she is met with resistance, forcing her to takes matters into her own hands to fight for the cause.