out of school at Santo Domingo HS when a prank by Shelly causes Mikey to unknowingly play a love song he composed for a girl for whom he had feelings to be broadcast before the entire school, resulting in embarrassment for him. Jerry Steiner (played by Troy Slaten) – A stereotypical nerd, in the first two seasons, he wears a trench coat (said to be made by NASA) from which he produces almost any object imaginable, apparently fixed inside with Velcro. He addresses everyone formally by last name, e.g., "Mr. Lewis", "Mr. Randall", and even "Mr. Kubiac", or collectively as "sirs". At the end of the credits of the pilot episode, Jerry hid in the locker next to Parker's, talking endlessly to Parker through the door, not knowing that he had left, causing him to plaintively call out: "Mr. Lewis? Mr. Randall? Mr. Phillips? (Clyde Phillips, the series' creator and executive producer) Hello?" One notable episode dealt with Parker and Mikey confiscating Jerry's trench coat for him to stop hiding and get to know a female nerd as a potential girlfriend. Grace Musso (played by Melanie Chartoff) – Principal of Santo Domingo High, she is Parker's arch-nemesis; at , she is said to be in her mid-thirties, but is actually older. She wants to get Parker expelled. Often, she breaks the glass on her office door when she makes her distinctive "thumb swoosh" gesture. She has a racy side which is sometimes exposed; her turn-ons include beards and large hands. She was portrayed as a spinster at first, but seemed to have a skill in men, one time having dated an officer of each of the armed forces. She has many secrets which she would rather be kept quiet, such as living in a $600,000 house on a $38,000 a year salary (episode six), which Parker uses as the necessity arises. However, Parker's blackmail ideas have sometimes backfired on him; one of his actions resulted in Musso's suspension. When a tougher principal is brought in to replace her, Parker cannot handle it going "from bad to worse", and works to get Musso reinstated. Shelly Ann Lewis (played by Maia Brewton) – Parker's other nemesis, she is his little sister, who attends the same school as a freshman. She likes to manipulate teachers and parents to her benefit and tries to get Parker into trouble. Shelly also teams up with Musso