Stan joins Roger and Steve's fictional detective agency, but he ruins the fun by being extremely incompetent at his "job." Roger demands that Steve fire Stan, but Steve cannot bring himself to do it and ends up lying to Roger. Things take a turn for the worse when Stan is kidnapped, and Steve must tell Roger the truth.

When Peggy’s brother is diagnosed with cancer, Jenny and the nuns are called upon to care for him. Jenny gets to know the siblings better. The Nonnatus House residents get involved in Fred’s latest money-making scheme which involves a pig called Evie.

When Peter decides to become a famous actor, he becomes Tom Tucker's agent as his first step toward stardom. Meanwhile, Chris dates a girl who looks disturbingly like a member of the Griffin household.

Marty goes to war with his son's school when Roscoe is accused of sexual harassment for trying to kiss a boy. On the home front, Marty's personal life is further complicated when April, a stripper he met in New York, suddenly reappears. Meanwhile, Jeannie starts to get cold feet at the prospect of her upcoming wedding.

Bo goes undercover as a high school teacher to investigate a mysterious case-Kenzi soon regrets agreeing to help her. Lauren makes a much anticipated return home from vacation.

After Mr. Gold's house is robbed, Emma keeps a close eye on him when it looks like he wants to track down the criminal and dole out some vigilante justice as payback, and Valentine's Day finds Mary Margaret, Ruby and Ashley having a girls' night out. Meanwhile, in the fairytale land that was, Belle agrees to a fateful deal to give up her freedom in order to save her town from the horrors of the Ogre war.

Grammy Gallagher shows up on a medical furlough and tries to track down a former meth lab protege that owes her money; Sheila plans Karen's wedding reception; Fiona double dates with Steve and his Brazilian girlfriend, and discovers that Steve is married; Ethel reacts to Clyde's death; Frank discovers the identity of Eddie's insurance beneficiary.

Marge and Lisa's mother-daughter Valentine's Day plans take a turn when Lisa meets Nick, an intellectual romantic who shares the same passion for culture, history and literature. Lisa and Nick fall head over heels for each other in a fairytale romance and make a secret getaway to Mulberry Island to profess their eternal love. Meanwhile, Bart and Milhouse are inspired by the hosts of "MythCrackers" to "crack" Springfield Elementary's own legends.

Rick and the others try to restore order in the aftermath of a terrible discovery. Hershel takes up an old habit and disappears, Rick and Glenn must follow him into town.

Jeremy Clarkson and Richard Hammond are on location with the forthcoming Sweeney movie as they take charge of shooting the film's climactic car chase. Clarkson uses his expertise to choreograph the stunt driving whilst Hammond directs the movie's lead actors, Ray Winstone and Plan B, and organises an explosive finale. Meanwhile, back at the test track James May casts a suspicious eye over the new Vauxhall Corsa VXR Nurburgring and gives his verdict on the brand new Fiat Panda. Plus, Hollywood actor Ryan Reynolds is the Star in a Reasonably Priced Car.