Season 3 (Arthur's Adulthood)

1. The Trio Power - Arthur, Buster and Fern become superheroes and save the day. (Aired October 5, 2009)
2. Music Brawl - Arthur and Buster get into a fight over music. (Aired October 12, 2009) 
3. Day of the Dead - The trio talks about their dead friends. (Aired October 19, 2009) 
4. Haunted House - The trio explore a haunted house, which gets them critically injured. (Aired October 26, 2009) 
5. Road Racers III (Sequel to Road Racers and Road Racers II) - Arthur joins yet another road race and yet again becomes hospitalized. (Aired November 2, 2009) 
6. Rock This World - The trio form a rock band, only to disband days later after Buster insulted Fern then Arthur punched Buster in the face for that. (Aired November 23, 2009) 
7. Greatest Day Yet - The trio spend quality time together and spend the night in a 5 star hotel. (Aired December 7, 2009) 
8. Fun Never Ends - the trio go to a frat party and get drunk. (Aired December 14, 2009) 
9. Christmas is Here - Christmas is here once again. (Aired December 21, 2009)
10. 2000s - The trio talk about going into the 2010s and leaving the 2000s. (Aired December 28, 2009)
11. Fern's Depression - Fern becomes mentally depressed, so she kills herself by jumping off the highest building in the world. (Aired March 15, 2010) 
12. A Duo - Buster and Arthur are the only ones left, they talk about Fern's sudden suicide. (Aired March 22, 2010) 
13. Buster Saves The Day - Buster becomes a superhero and saves the world from evil doing. (Aired March 29, 2010) 
14. Hope is Lost - Buster gets killed by a gunshot, Arthur has officially lost all of his friends and is alone. (Aired April 5, 2010) 
15. The Last One Standing - Arthur is alone and misses all of his friends, until they all come back as ghosts. (Aired September 5, 2010) 
16. Changed - The gang realizes everything has changed since Arthur's friends died. (Aired September 12, 2010) 
17. Like The Good Ol' Times - The gang spend time together like the good old times. (Aired September 19, 2010) 
18. The Best Time Of Our Lifes - The gang has the best night together in history. (Aired September 26, 2010)
19. Saying Goodbye - Arthur's friends are leaving Arthur again, they have a heartwarming moment, then they go back to heaven (or in Muffy, Francine and Binky's case, hell). (Aired October 3, 2010) 
20. The End (1 hour series finale) - Arthur is depressed, he mourns about his friends, talks about their deaths and then commits suicide and the series ends. (Aired October 10, 2010) 
Category:Seasons