Kimberly and Trini take on an unexpected responsibility when they agree to look after a mischievous little girl named Maria. What should be a simple afternoon of babysitting becomes considerably more complicated when Maria’s energetic personality gets her into trouble. The Rangers soon discover that protecting someone younger than themselves requires patience as well as courage. While Rita’s forces continue causing problems in Angel Grove, Kimberly and Trini have to juggle their responsibilities as Rangers with their responsibilities as temporary big sisters, proving that being a hero can sometimes mean looking after someone when they least expect it.