Phil and Keely have a huge test in Mr. Messerschmitt's class, but take advantage of The Giggle. Phil and Keely, then, both fail the test. So Phil tries to make it up to Keely. Meanwhile, Pim goes to an R-rated movie and brings curtis as her parent.

The Diffy's catch a futuristic disease called greenemia which causes them to turn green and act completely opposite to how they usually act.