Containing a number of promising elements that include the opening wedding misdirection, political intrigue keyed to Washington wives, an unusual information-gathering technique, and strong guest appearances by Henry Darrow and Celeste Holm, "I Do, I Do" cuts its honeymoon short thanks to a poorly-developed story by veteran television writer Richard Carr and meandering, unfocused execution by director Herb Wallerstein, which is keenly reflected in Lynda Carter's and guest-star John Getz's hesitant, uncertain performances in their pivotal roles that exemplify this episode's ultimate mediocrity.
In what is essentially an extended cold open, Inter-Agency Defense Command agent Diana Prince and Christian Harrison (Getz), an influential White House insider who has the president's ear, get married in San Francisco before driving to the Hacienda Health Spa. Carr and Wallerstein play it coy by letting viewers guess whether Diana has truly found love or if she is merely posing for an intelligence operation; however, they merely sow confusion despite the intrusion of a pair of heavies, which prompts Wonder Woman's intervention to help Christian, because it's only when he and Diana get to the spa that the latter premise becomes apparent--but not before some awkward exchanges between Carter and Getz that seem less like actual acting and more like genuine confusion about what they're supposed to be doing.
At the Hacienda, viewers learn that spa owner David Allen (Darrow) has truly learned to rub high-profile female guests, such as prominent Washington wife Dolly Tucker (Holm), the right way with a massage technique that coaxes them into a trance in which they recount cocktail-party conversations containing juicy insider information. But Dolly, thanks to a recent fall from a horse, has lost her susceptibility to David's soothing touch and--of course--lets him know she is going to expose him--which spurs David to arrange her final ride.
Moreover, David's motivations remain murky. Is he merely extorting money from this? Is he working for a foreign power? Given the potential for involving political machination, "I Do, I Do" could have been a nail-biter; instead, you find yourself filing your nails from boredom, which is why Carter must show off her assets in a bathing suit and tennis outfit along with her iconic Wonder Woman costume. Drawing on their impressive experience, Darrow and Holm project the most believability, but they were probably wondering what they were doing in this marriage of convenience divorced from plausibility and excitement.