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It's graduation day for high school senior Mike Seaver (Kirk Cameron), and his parents Jason (Alan Thicke) and Maggie (Joanna Kerns) are both thrilled and relieved. Less thrilled and relieved is Mike's sister Carol (Tracey Gold), who has just lost a long-standing bet that Mike would never make it to graduation. As the ceremonies proceed, the family flashes back to earlier times when it looked as though Carol's prediction would come true--and along the way, the viewer learns once and for all how Mike's pal "Boner" (Josh Andrew Koenig) earned his nickname. Featured as the younger versions of Mike and Boner are Victor DiMattia and Jarrett Lemon, who had recently costarred as Dennis and Joey in the live-action movie version of Dennis the Menace. This is the final episode of Growing Pains' third season.