Dr. Rhodes must confront his past when he treats a close family friend who's been impaled by glass in a case that reunites him with his sister. Meanwhile, a musician must decide to undergo surgery that will save her life but could destroy her hearing.
Rob and Sharon are estranged. While Rob falls off the wagon, Sharon has a heavy night out that could have dire consequences.
Detective Babineaux arrives at the crime scene of a wedding planner who was shot to death, and is shocked to realize that he used to date the victim. To make matters worse, we learn that the murder victim was stalking Detective Babineaux, and that he is now the number one suspect in her murder. Liv and Ravi pose as an engaged couple in order to infiltrate the victim's wedding planning business. Meanwhile, Major is having a tough time dealing with Liv on stalker brains.
After an explosion rocks a sleepy suburb, Lt. Joe Kenda must identify a pile of charred remains and find the killer who triggered the blast; a car chase ends in a violent showdown.
Jamie takes control of the rotator for the first time in months; Jamie turns to his competition for advice about a major decision that will determine the future of Heavy Rescue.
Vandal Savage arrives in Central City and sets his sights on Kendra Saunders. After Vandal attacks Kendra and Cisco, they turn to Barry for help. Realizing how dangerous Vandal is, Barry takes Kendra to Star City and asks Oliver and team to hide her until he can figure out how to stop Vandal. However, things quickly go from bad to worse when a man with wings AKA Hawkman shows up and flies off with Kendra. Meanwhile, Harrison develops a serum to make Barry run faster and asks Jay to test it out. The crossover continues on Arrow S04E08 Legends of Yesterday (II).
New obstacles threaten Jared and Carter's relationship; Max deals with the aftermath of his father's trial.
The Hailstones and Jessie work on projects to take advantage of the summer bounty. Glenn searches for a long lost cabin, and Sue reopens her camp.
After locating the original money pit, Rick and Marty Lagina examine an ancient stone carving that may help prove that Portuguese explorers with connections to the Knights Templar are behind the Oak Island mystery.
Shiners attempt to stay off the grid as the outside world encroaches on the backwoods. Tim breaks the news about the fate of Climax Moonshine. Jeff, Mark and Lance search for a new site before rivals can grab hold of the market.
Bob Baer and Dr. John Cencich continue their investigation into the death of Adolf Hitler by sending teams into three countries: Germany, Spain, and Argentina. Lenny DePaul and Sascha Keil find a never before discovered tunnel leading from Hitler’s bunker directly to Tempelhof Airport where Hitler’s personal plane awaited. Tim Kennedy joins a team of elite marine archeologists to search for a possible German U-Boat off the coast of Argentina. Lenny joins Gerrard Williams to investigate if Hitler could have arrived in Spain and remained hidden with the help of Spanish dictator Francisco Franco.
Ward's campaign for revenge brings the S.H.I.E.L.D. team to their knees, and Coulson proves he will do anything to settle the score.
Boden believes Maddox is behind Serena's accusations. Severide reaches out to Jamie, who's Maddox's lawyer, in an attempt to help. Patterson questions whether Boden can remain chief. Brett and Chili suspect that a man passed out in a garden is connected to a previous call. Otis has problems with his social calendar.
Mary Jane sits in on a journalism lecture and hears harsh opinions of her show; Patrick is surprised with a family intervention about his drug use.
Jessica and Honey's friendship hits a rough patch after an argument about the investment property. Louis's old friend Barry overstays his welcome. And Eddie starts a part-time job working for DMX.
Will gives Frenchie parfait spaghetti that makes Will go into Frenchie's memories; Debbie and Tyson must now prevent Will from taking Frenchie's position. Talia searches for Will to retrieve the spices. Soon after Talia gets a new cooking area, Talia and Dolores open a box containing items belonging to Talia's father, including recipe books and a fork titled "SpiceMaster".
Esmerelda makes Bella take the worst exam ever to prove her right to the title. The girls need Bridget's help. But how can Bridget intervene without being captured by The Founders?