Ep 9. My Sister the Weirdo / Turf War

In episode 9 of season 1 of Alvinnn!!! and the Chipmunks, we see Alvin finally getting fed up with his sister, Brittany's, weird habits. She spends all her time conducting bizarre experiments and drives her siblings crazy with her antics. After one too many mishaps involving Brittany's experiments, Alvin decides to take matters into his own hands by trying to change her behavior.

However, Alvin quickly realizes that he might be in over his head as he is unable to get through to his sister. Meanwhile, Brittany is oblivious to Alvin's attempts to change her and continues with her experiments and strange behavior. As tensions rise between the two siblings, it becomes a full-blown turf war in the Chipmunks' household.

As the conflict intensifies, Theodore and Simon find themselves caught in the middle of the feud. They try to stay neutral, but eventually get pulled into the fray as they are forced to choose sides. The Chipettes, Brittany's female counterparts, also get involved, further escalating the situation.

Throughout the episode, viewers see the sibling rivalry between Alvin and Brittany grow more intense as they both try to outdo each other. However, as the episode progresses, both siblings come to realize that their behavior is causing unnecessary chaos and it's time to call a truce.

In the end, Alvin and Brittany make up, realizing that their differences are what make them unique and special. The episode ends on a heartwarming note with the siblings back to being friends once again.

Overall, "My Sister the Weirdo/Turf War" is a fun-filled episode of Alvinnn!!! and the Chipmunks that captures the essence of sibling rivalry. It's a light-hearted and entertaining episode that will have viewers rooting for their favorite chipmunk.