Albeit tragic, the incident with the hamster has changed the dynamic between Kevin and his older brother Leo forever.

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.

As Kevin and Fede struggle to come up with the specifics of their science project, Kevin's older brother Leo is determined to interfere at every turn.

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.

As Kevin learns more about his sister's boyfriend, Luis, his opinion about him is no longer so cut and dry.

As Luis continues to spout his political beliefs, the situation grows increasingly tense at the dinner table.

Tension is in the air at dinner as Luis's questions to Kevin's mom grow increasingly personal- and offensive.

Kevin watches in dismay as Karen introduces the infamous Luis to their family.

Kevin gets educated on free love by his sister's boyfriend.

Kevin is less than thrilled with his sister's new beau.

Kevin experiences family spats at home while at school, his teacher attempts to teach the students the concept of values.