The doctors are exposed to flu-infected patients; Derek prepares to give a speech; a new doctor gives Alex a glimpse into an alternative medical practice.
When Lois is repeatedly insulted at Hal's family reunion, the boys plot revenge, and Hal is prompted to finally stand up to his father.
The gang head to Barbados for a palaeontology convention where Ross is the keynote speaker, Rachel harbours steamy thoughts about Joey, and Mike prepares to propose to Phoebe.
Brennan is called up for jury service, but the lack of watertight evidence means a footballer with the means and motive for murder may walk free.
Monica and Mike take part in an extremely competitive marathon ping-pong match, alarming Chandler but arousing Phoebe, and Ross's and Joey's fortunes change after revelations by Charlie and Rachel.