Diane's old school friend Heather Landon (Markie Post) seems to be enamored of Sam (Ted Danson). Finding this impossible to believe, Diane laughingly informs Sam that Heather is just a natural-born flirt. But as Heather apparently gets more serious about Sam, Diane's laughter fades. As if this wasn't enough trouble, there's also that vicious dog sequestered in Sam's office. ~ Hal Erickson, Rovi