A fan of Henry's Cosmic Cow comic strip who has been sending him increasingly bizarre fan mail breaks into the apartment one night through the unlocked front door, kidnapping his puppet and vowing in a note to return before the end of the weekend. Interpreting the note as a threat on his life, Henry and Monroe set up a stakeout at the apartment with the help of a police officer, who abruptly leaves them to fend for themselves when he is called away. (thetvdb.com)