Megan's running the school blood drive this year, but no one shows up to donate any blood, and Screech falls for the blood drive nurse Penny Brady. Meanwhile, the gang must find a chaperon for their hiking trip and Brian thinks that Screech will do. So, Brian schemes for Nurse Brady to go out on a date with Screech in hopes that he will go on the camping trip, while Mr. Belding tries to get in shape after learning of his high cholesterol level in his blood.