Morton and Bogart are best friends, but they don't always see eye to eye. When they encounter a closed door, Bogart thinks there must be something really bad on the other side, while Morton thinks it'll be something amazing! Morton wants to open that door! But Bogart is too scared. Which one is right? Together, these monsters learn that being open to the unknown can lead to new discoveries. And even though your imagination can make it easy to worry, it can also make life more fun.