When Marshall and Barney argue over the destruction of the Arcadian Hotel, Robin and Lily try to mix the right combination of cocktails that will force them to make up….

When Ted is faced with an important decision that might affect his future with Zoey, the gang expresses their true feelings about her.

Marshall becomes obsessed with saving the environment after seeing a documentary on garbage. Ted runs into The Captain. Barney admits he has feelings for a woman.

When the gang goes to a black tie event at the Natural History Museum, Ted gets introduced to Zoey’s husband, The Captain.

When Zoey enrolls in Ted’s class, she manipulates his students into taking her side in the fight to save the building being torn down to make room for his project….

Nancy must deal with the aftermath of Shane’s exploits, her Ayahuasca trip, and more confrontation with Guillermo. Celia’s struggles with her rehab partner, Barry, force her to find a new…

When Marshall picks up smoking again, it prompts Lily, Ted and Barney, ex-smokers all, to succumb as well. Meanwhile, Robin gets a new co-anchor at her show…

After Marshall witnesses a work buddy get yelled at after handing in a report, he becomes paranoid that the same will happen to him.