Mom tells Calvin to sleep tight and not let the bedbugs bite. After she leaves, Calvin wonders if that means they have vermin in the house. Hobbes says the mattress is moving. It must be a bedbug. Calvin sees giant bug legs. He runs for some bug spray and tells Hobbes to keep the monster bug trapped in the bed. Hobbes is on top of the folded over mattress. He tells Calvin to get his foot locker for more weight. Mom and Dad are wondering what's going on upstairs. Mom suggests it sounds like Calvin's moving furniture. Calvin starts using the bug spray. The spray doesn't kill it. Hobbes hears Dad coming and suggests Dad can kill the bug. As Dad enters the messed room with bug spray wafting everywhere, Calvin tells him it went under the bed. He tells Dad to get a fly swatter. Dad replies that he'll tell Calvin who's going to be swatted.