Fantastic Voyage: Initial idea

For my initial idea for this project, having my target audience in mind of a young child audience. I thought of using the plasma cells within the body as a police department, HBPD (Human Body Plasma Department) These cells with fight off bacteria trying to enter the body. They will do this by having the antibodies as their ammunition which they will fire at the bacteria. They will need to find the right ' ammunition' to fit the shape of the bacteria (as antibodies work). Once they capture the bacteria they will send in the White blood cells to destroy the bacteria.