Kat is excited to sleep in her own room - the big girl room - for the very first time. But her younger sister, Tina, is nervous to sleep in their old room without her. So, Kat comes up with a plan: she'll give all of her stuffed animals to her younger sister, and every time Tina gets scared, she should hold them close and be reminded of all the wonderful things each animal represents: bravery, creativity, love, and imagination. But that night, as a storm thunders outside their windows, it turns out that the big girl room can feel a bit lonely. And Kat might be the one who needs the extra support.