Luigi's new pet

Plot
Luigi begs Mario to get him a pet for his birthday, when Mario finally gives in Luigi and Mario get a pet turtle, Luigi takes it to his room and looses his pet, they then have to find it.

Main characters
Luigi is the main character of this episode, Mario, Wario, and Donkey Kong are also important characters. But Luigi is clearly the main character in this episode.

Side characters
There really isn't a side character in this one but the turtle is close enough to a side character only appearing in this episode, the turtle is very important in this episode, since the episode can't proceed without it.

Side story
This episode does not have a side story, the main story takes up the entire run time.