Kaz and Oliver are trapped in the ER by an evil Skylar and the Annihilator and the two villains plan on taking over the hospital and eventually, the world.
To fix a Los Angeles nuclear reactor that's on the verge of a cataclysmic meltdown, Walter and the team must reluctantly enlist the help of a troubled former member.
Ezra and Zeb go to Lothal's market for provisions and to work on their relationship.
Sidney gives up alcohol and tries to renew his focus on clerical duties, but is dragged into another case when there are mysterious deaths in the village.
When her efforts to save the planet prove hopeless, Hayley decides that she might get more attention if she becomes a blonde. Meanwhile, Stan and Steve go on a mission to find a new home for the Smiths.
Ben's country cousin Clyde Fife wants to become a hero like Ben.
The local elections arrive, so Marcus and Stylax sign up as hired clappers for wig-wearing politician Victor of the Gracchii. Grumio, however, is drawn towards another candidate named Julius Priscus. Could it simply be because he is giving away free promotional plums?
Computer graphics, visual analogies and a recurring cast of expert scientists combine to reveal new aspects of the world you think you know, from canyons of gravity that warp space and time to rain triggered by cosmic rays.
After Klaus and Elijah receive a cryptic invitation to dinner from their mother, they get ready to expect the worst.
This episode opens with a young man accidentally dropping a large quantity of cocaine from his jacket pocket outside a petrol station - all caught on CCTV. On the case are hard-bitten Detective Constable Colin Knight and fresh-faced Police Constable Oly Tomlinson, who joined the team three months earlier. They get off to a promising start, tracking down the owner of the vehicle the passenger was travelling in. DC Knight brings in his chief suspect for questioning and discovers that, just like the man in the CCTV footage, he has a striking tattoo on the right side of his neck, but could it be a case of mistaken identity? Also brought in to the custody suite is Darren, a man arrested on suspicion of theft of meat from Marks & Spencer. As he is booked into custody it soon becomes apparent he is a heroin addict. Sympathetic Custody Sergeant Pete Fitz-Gibbon tries his best to persuade him to stay strong and get clean. Both cases provide a stark picture about the dark world of young people caught up in a cycle of drug addiction and crime in Luton and the challenges facing the police as they tackle it.
Chase feels that it is unfair to be picked on by Adam every time and tells Donald. Douglas overhears and unlocks a new ability for Chase, upsetting the balance in the house. Douglas tries to fix things by giving Adam a new ability as well, but Adam and Chase end up fighting with one another. Meanwhile, Bree tells Leo about a contest at Tech Town as they are about to hit their one-millionth customer and Leo competes to ride on the first anti-gravity roller coaster and meet the owner of Tech Town. Principal Perry tries to compete to crush Leo's dream. In the end, Chase and Adam have a death battle, but eventually forgive each other and find out that Douglas gave Bree the ability to go invisible, scaring everyone in the lab.
Lulu and her brother, Jelani, are going to participate in a village festival. However, they need to practice their drumming skills. When they went off to get a snack, a mountain gorilla came down from a tree and starts beating the drums. Unfortunately, the gorilla gets scared and runs off, after seeing Lulu run towards him. How would Jett and his friends get the gorilla to come back and perform with them?
Min Ki, Han Cheol, Hyeok, and Ki Jun are shocked at how the country life is so odd. They now adjust to reality.
Kristine and Eric Bailey are in the military. When they got a transfer they move to Eagle River to find their dream home. Kristine's caveat: the house must have a picturesque view.
Shallon's fondest memories were of growing up in Alaska, and she always hoped she'd be able to move her children there. When she and Daniel got married, she started planting the seed. Now they are on their way to Fairbanks.
Ned and Jesse are forced into an impossible choice - Hani's life in exchange for technology capable of wiping entire cities from the face of the earth.
A returning customer brings in a toy that Walt always coveted; an aspiring student brings in an autographed book.
Simon Bricker returns to Downton to discuss the painting with Cora. Branson makes a difficult decision about Sarah Bunting. Rose encounters a handsome stranger. Determined to stop Isobel making the wrong decision about Lord Merton, Violet enlists the help of Doctor Clarkson. Charles Blake surprises Mary with a cunning plan to help her get exactly what she wants. Mrs Patmore seeks Carson's advice on a financial matter. Inspector Vyner returns with some ominous words of warning for Anna.