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.

As Marshall decides to join the "Save the Arcadian" movement as their lawyer, the gang starts to fall apart. The ladies try to mend fences between Barney and Marshall by serving them specific beverages to alter their moods. Ted forces Zoey to stay the night at the Arcadian to dampen her...