The Big Giant Head grants Sally's three-year-old request for a "gender reassignment" - and switches her body with Dick's. Meanwhile, Harry takes over Happy Doug's bar while Doug is on vacation. Responding to a three-year-old request from Sally that she be given a male body, the Big Giant Head switches Sally's body with Dick's. Each of them has to cope with all the thorny details of gender reassignment, including such specifics as how to deal with men's catcalls, and where to find cute shoes in Dick's size. Plus, each of them has to successfully maintain the other's romantic relationship. They each get as far as a kiss, but before things go any further, their request to switch back is granted, leaving them both far more knowledgeable about what it's like to be a member of the opposite sex. Also, vacationing Doug leaves Harry in charge of the bar, which turns ugly when some tough-looking bikers start hanging out there. Just when Harry and Tommy have decided that the bikers aren't such ba

After Will installs a new heating vent in the apartment, he and Grace become obsessed with eavesdropping on the marital problems of the couple downstairs. Meanwhile, Jack's new career this week is playwriting and he enlists Karen's help in staging a play to bring them back to reality.

Mike can't stop thinking about Nikki. Nikki is ready to take the next step with Arthur, but Mike is worried about that. Paul unwittingly has an affair because Stuart needs him to. Stacy dates a job-obsessed cabbie just because he looks good. James inadvertently causes a taxi driver strike, which interferes with Arthur getting to the airport. You see, if Arthur misses a plane, he and Nikki will have sex.