As the Klondike winter closes in, the final race for gold intensifies. Todd runs two massive washplants, Tony pushes to get his dredge out of the water before it freezes and Grandpa John arrives to find out if Parker has beaten his rival Todd.
As Frank deals with a new threat to his candidacy, Claire has doubts about their plan. Claire faces a difficult decision concerning her mother.
A patient from Meredith's very first surgery as an Intern is readmitted to Grey Sloan Memorial with a new aneurysm, and Amelia takes her case. Meanwhile, Maggie suspects that Richard knows about her relationship with Andrew, and Arizona debates dating again.
Annalise moves forward with a plan to protect the team from Philip but the risk involved may prove to be too dangerous. Meanwhile, Wes continues to search for new information regarding his mothers death. In flashback, the Mahoney case takes a drastic turn for Annalises client.
Louis C.K. cancels a show in Portland due to a family emergency; Fred and Carrie are asked to judge a plume contest.
A high-ranking Resistance member is ready to cut a deal. Katie receives a second chance. Bram proposes a risky journey outside the colony walls.
When Watson runs into Captain Gregson and his secret girlfriend, a former NYPD officer, she inadvertently sets the couples breakup in motion. Also, Holmes and Watson investigate the murder of a wealthy woman who left her considerable estate solely to a beloved dog.
The guys play a game of copycat at the park while babysitting kids. Then, they hit the supermarket for an epic battle of catch and release, and the loser learns that creeping around the gym is more uncomfortable than working out.
Harlee's collaboration with Stahl Warren Kole uncovers Wozniak's secret relationship with Donnie. Wozniak decides to take charge of the big job after picking up a package that turns out to be a kidnapped man. A mysterious call to Saperstein's desk forces the crew to face their mixed feelings about their fallen friend and ultimately decide to preserve his memory.
Eddie drags Chip and Martha on a road trip to deliver some cowboy justice.
Lexa tries to maintain peace and order within the clans, and Clarke uncovers a strange and game-changing truth. Meanwhile, a flashback takes us into the darker chapter of humanitys past.
Floki learns of the heavy price he has paid for his actions. Rollo finds an unlikely ally in Count Odo. Bjorn has to fight a fierce opponent in the wilderness.
The Unconventional Challenge finds the designers turning New York City emergency services materials into runway-worthy looks.
After receiving a distress call from another timeship stranded in space, Rip decides to answer the call in order to use the other ships computer to track Savage. The team is suspicious and warns him this could be a trap but he moves forward with his plan. Ultimately, the team was right and they have to battle time pirates. With most of the team captured, it is up to Professor Stein to rescue them all.
John and Joan disagree with their neighbors, Jerry and Pam, about who gets to use the hot tub when new property lines are drawn. Also, Greg and Jen invite their exterminator and his wife over for dinner, Matt and Colleen make an effort to be friends, and Tim is terrified to perform minor surgery on John.
Sean Lock and Bob Mortimer take on Jon Richardson and Holly Walsh. Isy Suttie's in Dictionary Corner with Susie Dent. Claudia Winkleman stands in for Rachel Riley on letters-and-numbers duty.