In an effort to get the goods on the 73 crew, Binghamton lures the boys into the hospital under false pretenses, and has them injected with sodium pentothal, or 'truth serum', which causes them to tell him everything he wants to know. McHale and Parker must then work up a plan to get them off the hook, by literally giving Binghamton a dose of his own medicine. (thetvdb.com)