After Marvin's heart attack, everyone's worried about the health of their heart. Barney's worried that he has one as he navigates his feelings for Nora. Robin dates a dog in human form.
The whole gang heads to Cleveland for Punchy's wedding where the crowd eagerly anticipates Ted's emotional toast. Lily tries to keep her pregnancy a secret and Robin wonders if she's really done with Barney.
Barney and Ted battle to push the button to blow up the Arcadian; Barney and Robin battle against Ted reuniting with Zoey; Marshall battles against and anticipated stomach poisoning and we get some good dramatic news at the end.