Kay AND Jay track an unregistered, unidentified alien arrival, who turns out to be the King of a slug-like race called Tunstons. These robosuited aliens are plotting to take over New York City, and then the world, by covering ft in the bacterial ooze that Tunstons need to survive. Unfortunately, the giant robosuit created for the KING is damaged in a battle with Kay and Jay, so the alien King must take up temporary residence in Frank the Pug. As most everyone in the city gets sick from the bacterial ooze, the Tunston King plots to seed the clouds and trigger a bacterial rain that will accelerate the plan to turn Earth into a Tunston colony. Kay and Jay must stop the Tunstons and find a way to save Frank.