When the penguins accidentally destroy Leonard's habitat during a game of hot potato, Alice decides to put Leonard in the kangaroo pen. At first Joey is pleased with having a roommate, but soon starts to get annoyed with Leonard's nocturnal antics (sleeping all day and keeping him awake all night). Joey then becomes enraged when Leonard accidentally bursts his bouncy ball. The penguins then rescue Leonard, which sets off a wild chase into the sewers. Leonard then begins to insult Joey, which angers him even more. After taking out the penguins and finally cornering Leonard, he confesses that if the penguins hadn't destroyed his habitat they wouldn't be in this mess. Joey somehow understands that, and the two become friends due to them both having a certain hatred towards the penguins.