In the wake of the hamster incident, Kevin and Leo's relationship is strained, to say the least.

As Fede grows increasingly concerned for the health of Nico, the hamster at the center of his and Kevin's science project, Kevin's brother Leo's behavior becomes increasingly erratic.

As Leo begs his girlfriend to come over, Kevin is eager to wrap up his science experiment in spite of his partner Fede's reservations.

When Kevin's parents go out and his sister neglects her babysitting duties, the tension between Kevin and his brother, Leo, comes to a head over Kevin and Fede's science project. Will their hamster survive? Will Fede and Kevin?

The power struggle between Kevin and Leo continues as their parents attempt to go out for the evening, leaving their sister in charge.

The time has come to present their natural science project in front of their class, and Kevin and Fede have yet to even begin.

During some sleepless nights, Kevin contemplates the complexity of the universe— as well as his relationship with his brother.

After ditching his accordion recital to play soccer, Kevin must face his father.

In the conclusion to her interview with the team at the radio show Tu Voz Estéreo [Your Stereo Voice], in the wake of some tragic events involving her friend Mariana and Mariana's boyfriend's mentally disturbed mother, Paola offers an update as to the fates of both.

In order to keep his spot on the soccer team, Kevin must quit his accordion lessons and simultaneously risk disappointing his father. What will he decide?

As Doris flees from the police, they enter her home to find a wounded Mariana and a chemical stench in the air.

Doris discovers that the police are outside her home and attempts to flee with her son.

When the police finally arrive, a hysterical Paola implores them to enter the home of Doris and her son Sebastián as soon as possible to find out what has happened to her best friend Mariana.

Kevin has won his father over by telling him he shares his love for vallenato music. Unfortunately, however, it isn't true, and now he must deal with some unexpected consequences.

Suspecting that her friend Mariana is in danger at the hand's of her boyfriend's mother inside their home, Paola wants to enter as soon as possible to find out what's going on. However, the help she has enlisted from the hosts of the radio show Tu Voz Estéreo [Your Stereo Voice] inform her that they must obtain authorization from the police in order to enter the home.