The play is set at a summer camp inside the human body. The Counselors and Campers are cells, including Heart Cells and Red and White Blood Cells.

It is visiting day at the camp. The audience is cast in the role of parents and family members who are on a tram tour of the camp.

The tram starts in the Brain, visiting three cabins: the bone marrow (Red Blood Cell cabin), the lymph node (White Blood Cell cabin), and the Heart.

Traveling in arteries between cabins, the tram encounters Emotions crossing, an Enzyme Demolition Crew clearing a road block and an Endocrine Mail System.

The tour is also treated to two of the Brain's dreams, one about the quest of a Bald Babboon for freckles to eat and the other about Fairy Princesses protecting a Gnome from a Witch.

An unexpected detour takes the tram to the pancreas where we meet the London Flu on their way to the Brain to take over and disrupt the body.

All cells are advised to keep arms and legs (if you have them) inside the tram and enjoy the tour of Camp In-The-Body!