|Number in season:||8b|
|Original Airdate:||October 23, 2000|
|Written by:||Peter K. Hirsch|
|Storyboard by:|| John Delaney|
"The Last of Mary Moo Cow"
Buster fears the worst when it's time to meet his mother's new boyfriend.
School has just let out for the day and all of the students are leaving, Buster meets up with his mom and they greet each other the way only they do before leaving. Arthur begins to talk how Buster and his mom are great friends. Such as seeing loud movies together, they also do chores together and make it fun! Sometimes they'll also just eat together. But unfortunately it might change when Buster meets his mom's new boyfriend...
Bionic Bunny is on when he hears a little girl crying for help. She has a splinter and he goes to remove it when he suddenly sees green leak from her eyes. He claims she isn't an alien and the "little girl" transforms into an alien. Just as she prepares to attack Buster suddenly gets a call and his mom takes the phone. The following day, Arthur angrily tells him he waited twenty minutes for Buster to return, but he never did. Buster points out that his mom has been acting weird, like smiling a lot.
Muffy then claims it's a boyfriend. Buster denies this until Muffy points out so many obvious signs and Arthur claims maybe she really does have a boyfriend. In class, suddenly Mr. Ratburn is giving the kids back their assignments and after seeing the grade he got, Buster is sure that Mr. Ratburn must be his mom's new boyfriend.
Buster then proceeds to have a fantasy about his mom, himself, and Mr. Ratburn at dinner and does not like how it goes down. He then begins to worry, imagining them marrying each other at some Vegas-like wedding chapel, and then eventually they'll end up having children.
Soon, Arthur snaps him out of it as Mr. Ratburn comes by and Buster begs him to say something about his mom, like she's ugly, or crazy. And so, Arthur claims that his mom has a lizard she feeds rats to. But Mr. Ratburn only likes this, as he likes lizards. At home, Buster begs his mom not to marry Mr. Ratburn, but Bitzi has no clue what he's talking about. She tells him that she isn't dating Mr. Ratburn, and on Friday she wishes to bring Harry over for dinner. Buster has no clue who this is, though.
Walking with Arthur, Buster begins to grow suspicious that Harry seems too perfect. He might be an alien. To which he begins to fantasize about until he once again snaps out of it moments later. Arthur tells him he isn't an Alien, and he doesn't need proof to show that he isn't. Buster still wants to make sure though and he puts Batteries into his "alien checker" when suddenly the doorbell rings. Bitzi asks him to get it and Buster opens the door to see Harry, who then makes a joke and Buster lets him in. They have a decent dinner, and Harry even makes him laugh. They have a very nice evening and he then offers them some dessert. They then go to get plates and Buster checks said dessert, to make sure it's not some trick and realizes he actually has a lot in common with Harry.
Bitzi then tells Buster she'll tuck him in soon as he goes to bed. Even if he is an alien, Buster thinks he's a nice one. Bitzi then tells Buster if he didn't like Harry then they won't have to see him again. This makes Buster confess that he's a little worried that she'll forget all about their special things together if she gets too involved in the relationship. But she confirms that would never happen and they go to a hockey game shortly afterwards, where Mr. Ratburn states feeding rats to lizards isn't too healthy for them before he takes off. Bitzi asks what that was about when both Harry and Buster pull out their alien detecors and claim Mr. Ratburn to be an alien as the episode ends.
- Norman Hedgehog
- Prunella Deegan
- George's sister
- Sue Ellen Armstrong
- George Lundgren
- Maria Pappas
- Jenna Morgan
- Fern Walters
- Francine Frensky
- Alan Powers
- When Buster checks his Alien Checker with the TV, he turns to a show which is a parody of "Who Wants to be a Millionaire" because the host says, "Is that your final answer?"
- The Tex Hotel (across the street from Elvis Chapel of Love) in Buster's imagination sequence is seen again in "Arthur and the Whole Truth" in Season 20.
- When Mr. Ratburn asks Buster to think of the number between 1 and 10, Buster replies 7, and Mr. Ratburn says the answer was "3.141592675, also known as Pi". In reality, the digits are 3.141592653 (the last 2 digits are different).
- Buster's alien detector is damaged when Harry enters Buster's condo, but two alien detectors appear later in the episode.