As superhero good-deed-doers, Zee & Nina transform into Incredi-Wheels & Super Sidekick Sister (or “Triple S” for short) whenever a good deed needs doing. One day, while playing at the park, Zee & Nina hear their friend Zoey call for help. They spring into action, encouraging Zoey to become her own superhero as they work together to figure out who stole Zoey's book.