This strip was originally published in the newspapers on November 24, 1985.
Calvin asks Dad to check under the bed for monsters, which he does. Then, he asks to have the dresser checked. Dad refuses. Calvin is sure that's where the monsters will be hiding, and that they'll come out when Calvin goes to sleep. Calvin decides to be proactive by arming himself with a suction dart gun and giving Hobbes a horn. The plan is to irritate the monsters by honking the horn, then shooting them. As they execute their plan, a monster comes in the door. Dad, with several suction darts sticking to him, asks Mom to come upstairs. Calvin is heard saying he was going to finish off the monster when he found his baseball bat.
This strip was also published in the following books:
The Essential Calvin and Hobbes on page 21
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