Rip takes the team to 2166 London, three months before his family is killed. He believes this is their final opportunity to take out Savage, who is at the height of his power. They discover two key elements to defeating him, one of which is Savage's daughter.moreless
Claire and Wes convince President Winters to round up all the children in the hopes that they will negate Drill's primary weapon against them. However, Drill manages to infiltrate the quarantine facility.
Both the Ark and the 100 celebrate Unity Day. The Ark is devastated by first an explosion, then an attempted coup. Meanwhile, on the ground, Clarke, Finn, and Octavia set up a meeting with the grounders.moreless
Clarke and Bellamy search for supplies as winter nears. Meanwhile, Octavia helps a friend escape.
Mary Margaret goes into labor, and the residents of Storybrooke rally to protect her new baby from Zelena. In the Oz of the past, Glinda tries to convince Zelena to join the good witches as a protector of Oz, but the appearance of Dorothy Gale from Kansas may push her over the edge.moreless
The killer: Paramedic Stuart Fletcher; the victim: Graeme Jenkins
Jenkins, who died in a skydiving accident, turns out to be a 40 year old man dying of terminal cancer. He dies because both of his parachutes were sabotaged and failed to open. At first, suicide is considered as the team finds it hard to believe that a terminally ill man would end his life in the middle of his bucket list activities. More puzzling is the fact the team cannot find a place where the two men might have met. Meanwhile, Angie provides Oscar with the police file of what happened between her and Cross ten years ago.
A search-and-rescue mission ends in surprise. Meanwhile, Raven helps Abby craft an escape pod.
The fate of humanity is on the line as Walter plans to make the ultimate sacrifice to stop the Observers before they were ever created.
A wrongly convicted Southern chef hires Shawn and Gus to find the real thief after the Innocence Project frees him from prison.
While Carter and the Apollo search for the missing city of Atlantis, Sheppard and his team risk their lives on a mission to steal a Z.P.M. from the Replicators.