Our hero microglia cells and Alzheimer's disease
Microglia cells do not mess around.
They live in and defend the brain and spinal cord against threats foreign and domestic, including, detecting damaged or unhealthy neurons. They eat the bad guys – or foreign invaders like bacteria and viruses – and display the chewed up parts on their cell surface to signal for help.
If these cells had costumes, they would be draped in a superhero cape on constant patrol for bad guys.