Shawn and Gus must recover a deadly pathogen before a thief releases it into the city.
Grylls crosses the Sahara desert to the North Africa coast, where he catches an octopus, fashions a shelter out of acacia trees and dines on moths and locusts.
On the island, the Man in Black attempts to recruit Sawyer in his attempt to leave the island, while an impromptu funeral is held for the real Locke. In the flash sideways, Locke is fired from his job and becomes a substitute teacher.
A player-recruitment weekend brings out a running back who poses a threat to Craig's position while Alex tries to enlist the top high-school quarterback for Blue Mountain State.
Mike reminisces about jobs where he had to work in tight spaces, including the time he cleaned the inside of a buoy, his adventure in an abandoned mine, and an insulation application assignment beneath a home.
Maxine is desperate to make a good impression at her parents' party so cajoles Ian into pretending to be her boyfriend. He reluctantly agrees, but their act unearths deep feelings that take everyone by surprise. Meanwhile, Carl realises what he's lost by splitting up with Maxine so he is determined to win her back. But Carl soon finds love and hate are two sides of the same coin when Micky reveals a painful secret. At the Jockey, Mimi does her best to conceal Karen's illness after she returns from the psychiatric unit. While Karen settles back into Chatsworth life, Jamie struggles to cope with the reality of living with mental illness. Escaping for a night out, Jamie meets Michelle, a Madame of a thriving male Escort Agency who plans to seduce him into a murky but lucrative new job.
Buddy, Tiny and Mom make a play date with Petey Peteinosaurus to ride the Dinosaur Train to meet Arlene Archeopteryx, a bird from the family of the oldest birds ever! The kids are excited to learn that Arlene is a bird and a dinosaur.
A concerned homeowner contacts CPD when her house guest is choked in her sleep by an unseen force. The team quickly finds an unusual connection between the victim and a deceased girl who used to be best friends with the home owner's daughter. Moriah's skills as a medium are quickly utilized in order to make contact with the deceased friend in an effort to stop the threatening behavior.
Shiny and Don stay at home. We get to see that just because they don’t always ride with Buddy and Tiny on the Dinosaur Train doesn’t mean that they are not having fun. An adventure into a local caves leads to a marvelous and brilliant discovery.
A massive force of water threatens everything man leaves behind. American cities faces a deluge from failed levees, famous paintings meet a tragic fate, and a unique feature of the Sydney Opera House's famous rooftop leads to its collapse.
Reunited and on the road, the Family travel south on the look out for a new home. They encounter a small but thriving community of survivors and decide to take up their offer of hospitality. While Al and Sarah enjoy their new romance, Tom simmers as Anya makes friends with Judy, the community's leader. Greg and Abby return to Greg's house one last time where Greg spots the mysterious postcard, leading him to an abandoned airfield and an encounter with the disturbed Mr. Stevens. Meanwhile, Sarah discovers an elderly couple dying from a new, mutant strain of the virus.
Harry loses his cool with 3 swimmers that he's forced to rescue just seconds after warning them not to swim in a dangerous area. However, calling them "imbeciles" and "idiots" puts him in hot water.
Murdoch finds himself with amnesia and running for his life on the streets of Bristol, England, very far from home, if he knew where his home was. Taking refuge in a pub, he gains the assistance of a vivacious barmaid who helps him reconstruct his memories, escape his pursuers, and foil an assassination plot.
George and the Man with the Yellow Hat convince Professor Wiseman to take a well-deserved break from work. But a stuck pickle jar, a tangled hammock, and a duck floating away with the Man's beloved hat turn their relaxing picnic in the park into one stressful afternoon. Still, could a day of creative problem solving be exactly what the monkey ordered for Professor Wiseman?
George is excited to some day go to school, so Allie decides that he should visit her kindergarten class for a day. But, as it turns out, there are lots of rules about what you can and can't do and George is a bad follower. But things change when George and Allie decide to build a castle in the classroom based on a book they read.
Off to a rocky start at her new school, Lux offers to throw a party in Baze's loft in an effort to impress the high school quarterback, Jones, and his friends. Cate worries that her relationship with Lux will never measure up to the bond Lux has so easily made with Baze.
The kids are grossed out when the new lunch lady serves only disgusting, red glop and won't let them leave until they finish eating it. So, everyone tries to escape the cafeteria.
Prank Day arrives and the boys can't wait to show off their skills. But when Yo can't stop pranking Fanboy, the boys are forced to enlist Boog to help them prank her back.
Patty drills Louis Tobin about his fraud while his son Joe makes a decision that will determine the fate of the Tobin family forever.
Nathan tries to help Haley and Jamie confront Lydia's seemingly hopeless situation, while Brooke and Julian navigate their volatile relationship in the midst of a hectic movie shoot. Meanwhile, Clay and Quinn spend some time apart, and Miranda tries to prove to Grubbs that she's the right person to produce his album.