Dr. Martin makes his on-air debut at Radio Portwenn, the local radio station and, no surprise, he's not a natural in front of the microphone. Meanwhile, a nasty stomach bug is sweeping through Portwenn. People are dropping like flies, and filling Martin's office. Martin decides he must try to track the source of the bug, and looks to the public swimming pool. When the pool staff refuses to shut it down, Martin makes an announcement to everyone in the pool about something dangerous in the water, creating mass panic.