On a school trip to the Aberdale Natural History Museum, Clarence and Sumo check out the displays, goof around with the exhibits and even remove a tooth from the T-Rex display.

Jeff and Sumo expect no one to show at Clarence's birthday party, just like last year. When dozens of kids arrive, the boys struggle to get face time with Clarence, the popular party host.

Clarence, Jeff and Sumo make it their mission to climb a really tall tree before it's set to be chopped down. As they scale higher and higher their reality begins to slip away.