Despite Skipper forbidding him to invent, Kowalski defies him and constructs an invisibility ray. While testing it in the park, the device itself is accidentally turned invisible when Fred falls on it; shortly, it also gets loose on the streets of New York because of Julien's meddling, firing its laser randomly and rendering objects in the city invisible. The four penguins soon go on a mission to stop the device, Skipper believing Dr. Blowhole is behind the mayhem. The team manages to ram the unseen ray with a bus and Kowalski successfully defuses the device following a resulting overload. Objects once invisible, including the ray itself, become visible again. Kowalski keeps trying to say that the ray was his, but Skipper keeps interrupting Kowalski and still believes it was Blowhole's technology.