Morning breaks and Francine greets Stan in lingerie while carrying his breakfast to the bed. She asks Stan if he knows what today is and Stan gets excited about the CIA fishing trip. He scarfs down the breakfast and throws the dishes on the bed. Francine is outraged that Stan forgot their anniversary.
Jeff, meanwhile, wants to take Hayley to Burning Man, but she's not interested. Down at the mall, Steve and friends see the very attractive Lindsay in the food court. Snot dares Steve to ask her out and Lindsay agrees on one condition. Steve finds a date for her friend Jewel, a huge, hairy girl. Steve's friends run away at the sight of her.
At home, Roger puts on a tape of COPS from last year, when the police had to break up Francine pummeling Stan for forgetting their anniversary. Out on the boat, Stan finally realizes what day it is and heads home, terrified. When he arrives home, Francine wants nothing to do with him. Stan gasses her, and then takes her into CIA headquarters to have her memory erased.
But instead of erasing the last 20 hours, the technician erases the last 20 years. Francine thinks it's 1985 and she's a Def Leppard groupie again. Back at home, Francine comes to and is freaked out by her family, not recognizing any of them. Stan tells the family that they have to maintain the illusion that Francine is 18 or her brain might implode. Stan puts Francine back in her old apartment and tells Hayley to be her roommate.
While Steve is busy begging friends to date Jewel, Francine comes to across town. Thinking she just woke up after a concert, Francine inadvertently reveals to Hayley that she used to be a party girl. Stan, meanwhile, is explaining to Roger how she and Francine first met. He picked her up as a hitchhiker, accidentally hit a small critter, and then shot it to put it out of its misery. Roger advises Stan to recreate the moment to bring back Francine's memory.
Stan gets Hayley to abandon Francine so he can pick her up on the road. He then tries to hit a raccoon, but misses. He tries to shoot it, but Francine pushes the gun away. Stan gets in the car and tries to run down the animal. After a long, elaborate chase, the raccoon ends up in a speedboat that crashes into gas tanks and explodes. Francine runs off and gets picked up by a truck driver.
Steve dresses Roger up as a Rastafarian to give Jewel a date. Roger tries to run off when he sees Jewel, but Roger stops him. Jewel immediately takes to Roger, which freaks Roger out. But that leads to success for Steve because Lindsay likes seeing Jewel happy. Elsewhere, Stan wants to show Francine a flower from their honeymoon to trigger her memory, but she's left for Burning Man with Jeff. Stan and Hayley take off after them.
Back at the Smith house, Jewel tries to kiss Roger and finds out that he's an alien. Lindsay is warming up to Steve, when Jewel tries to run out. Roger hits Jewel and Lindsay with a frying pan to knock them out before they can spill the secret.
The next morning, Stan finds Francine and shows her the flower. But it does nothing for her. She thinks Stan is a stiff she could never love, so he strips his clothes off. Just then, a hang glider crashes into the giant man, knocking it on Francine. Stan saves her, and then kisses her, which finally triggers her memory. Stan, Francine and Hayley arrive home to find Jewel and Lindsay bound and gagged. Stan takes them into CIA HQ for a memory cleanse.