Yonk's heart attack brings most of the class flocks to the hospital where Nicole faces a hard decision. Kat's breakup with Benjamin leads Ethan to realize there might be something between them. Richie and Lina debate their future.

Duncan and Richie let Yonk buy them lunch so Nicole can use the time to pack her things move out. Ethan stumbles across a secret and deliberates whether to tell Kat.

Duncan and Richie finally finish repairs at the Allen home, but Nicole feels a loss when they leave and takes action. Meanwhile, Ethan feels compelled to break it off with Palmer, but a third party inadvertently gets involved.

A Valentine's Day snowstorm strands the class away from the ones they love, and leaves some of them with interesting ways of trying to re-unite.

Lina and Richie's first dinner party as a couple goes awry; Nicole supports Yonk on his diet but backslides; Kat panics with news from Benjamin.

Ethan and Kyle listen in on a conversation between Kat and Benjamin, leading to changes with Palmer. Nicole gets jealous of Duncan and Lina gets out of her wheelchair.

Lena confesses to Nicole that she has yet to be intimate with Richie, who, in turn, convinces Duncan to tell Richie to take the plunge.

Richie returns home one final time to get his things, only to find his wife there, who finds out there's another woman in his life. Ethan uses Kyle as a buffer for Kat at a party.

Yonk and Nicole celebrate their one year wedding anniversary while Richie and Lina work on their relationship. Kat's new neighbor is just a little too perky for Kat's taste...but not Ethan's.

Richie accidentally crashes his car into a convenience store, bringing the whole gang together to help him.

The Class celebrates Thanksgiving while Lena and Richie reach a crisis in their relationship.

Ethan struggles with telling Sue the truth about himself; Richie and Lena's relationship takes a big step while Lena gets a surprise visitor.

Nicole, Richie and Lina go to see Duncan's band reunite and perform at a bar while Ethan and Kat interject themselves into a blind date.

Holly does a remote from a children's petting zoo, where she becomes involved in an unfortunate accident. Yonk invites Duncan and Richie to Atlantic City while Ethan and Kat have a dispute that looks a lot like flirting.

Duncan hires Richie to help him repair Nicole and Yonk's house; Kat teaches Ethan a secret about buying frozen yogurt; Lina faces new challenges as she returns to work.

Richie and Lina go on their first date; Nicole's life gets complicated as Duncan and Yonk begin to bond; Holly and Perry keep the pressure on Kyle to get their daughter into private school.

Ethan and Kat fight over the leather coat belonging to Ethan's ex while Holly reports on the approach of Hurricane Fernanda.

Ethan and Kat visit Lina in the hospital after she was run over by Richie.

Ethan Haas reunites his third grade classmates for a party as a surprise for his girlfriend.