"Strange Case" is the fourth episode of the sixth season of ABC's Once Upon a Time and the one-hundredth and fifteenth episode of the series overall. It was written by David H. Goodman and Nelson Soler. It aired on October 16, 2016. It was written by David H. Goodman and Nelson Soler and directed by Alrick Riley.
Big Ben is featured in the forest.
In the Character's Past
In the Victorian England realm of story, Dr. Jekyll is joined by his friend Mary Lydgate, whose father, Dr. Lydgate, is a member of a prestigious science academy, as he hopes to convince him to back his project that he created, a serum that separates personalities, only to be rejected. The experiment would later attract the attention of Rumplestiltskin, who suddenly appears and helps Jekyll perfect the serum, and when Jekyll drinks it, he transforms into Hyde for the first time. That night at a party, Hyde, with the help of Rumplestiltskin, confronts Mary’s father and threatening to expose the truth about him sleeping with his lab assistant, if he doesn’t grant Jekyll his membership into the academy. In the morning, Jekyll wakes up and remembers nothing but finds himself to be an academy member.
Later on, Rumplestiltskin's influences Jekyll to become Hyde again, this time to win over Mary, revealing that Jekyll has strong feelings for her, but she admits that she isn’t interested in the same way and wants a man who wants to embrace passion without getting rid of it, and the two kiss. The following morning, Jekyll and Mary are waking up in bed together and are shocked by the outcome, as Jekyll tries to convince her that he is Hyde, but Mary is upset that Jekyll tricked her and tries to run away, prompting an angry Jekyll to push Mary out of the window and to her death. Realizing what he has done, Jekyll drinks the last of the serum and escapes as Hyde.
At the pawnshop, Gold is looking in the mirror and sees his hair as he prepares to cut it, giving him a more crew cut appearance. He is soon visited by the Evil Queen and Hyde, who demand a necklace. As Gold chokes Hyde, he learns from the Evil Queen that he can't kill him (or her) that easily, although she tells Gold that their deal to protect Belle and his unborn baby is still in effect. When news leaks of Hyde escaping the asylum, this suddenly disrupts the normal life for David and Snow, as well as for Emma and Hook, who is ready to move in with her. When Regina and Jekyll show off the necklace, they soon discover that the serum will be vital in defeating The Evil Queen and Hyde. With Hook having moved out of the Jolly Roger, he gave Belle a magical seashell to use as a emergency, but Gold stops by to offer her protection from Hyde. After Belle refuses, Gold places a protection spell on the ship in order to prevent Belle from leaving and keep Hyde from entering. Later on, Regina asks Gold for help, only to discover the Evil Queen and Hyde have already destroyed the lab and Jekyll is left unconscious, but the ambush does leave a splatter of the serum, prompting Gold to steal Jekyll’s heart, then pours the serum onto his dagger that will be useful in killing Hyde. As Gold leaves, he tosses Regina Jekyll’s heart back, who then goes to the Jolly Roger to stay with Belle.
In the woods, David and Emma find Hyde, and this time he is ready as he overpowers them almost immediately, only to have Gold come out of nowhere and stabs him in the heart with the serum-covered dagger, but that fails as well, as Hyde tells Gold that he switched serums with Jekyll earlier, then uses the opportunity to take the dagger and control Gold, ordering him to take them to Belle. When the two appear in front of the Jolly Roger, Hyde says that there is one final twist. It turns out that that Jekyll is actually the ruthless one, as his aggressive and obsessive behavior of his lost love starts to worry Belle as she attempts to use the seashell to contact Hook but Jekyll breaks it, and her attempt to escape is prevented by the protection spell, and only Gold and Hyde can do is look on. Jekyll attempts to kill Belle as revenge against Gold for what happened to Mary (which Hyde also wants). Luckily, Hook appears out of nowhere just in time to save Belle. After a brief fight, he overpowers and kills Jekyll by knocking him into the sharp end of a harpoon, impaling him. Just as Hyde was about to command Gold to do something else, he dies along with Jekyll. It is then discovered that the one surefire way to kill one's serum persona is by killing their original, which means the same thing that happened to Jekyll and Hyde can be done with Regina and the Evil Queen. Regina is unsettled at this discovery, and the possibility she might still hold evil within her as with Jekyll. She asks Emma to "do what is necessary" to keep from returning to evil, while an angry Belle confronts Gold about his deal with Hyde. He reveals that, back when she was a slave in his castle, he was worried about the feelings he had for her. Gold sought out Jekyll to see if his serum could rid people of "weakness," but when his experiment proved a failure, he angrily banished Hyde to the Land of Untold Stories. Belle is still distrustful with Gold, but he insists she will need him to protect their child, claiming that “necessity” will make her love him once again.
Back at Storybrooke Elementary School, Snow resumes her role as teacher, and introduces her new assistant Shirin to the class. Realizing that the students are struggling, Shirin suggests that Snow embrace her past to inspire them. Taking a cue from Isaac Newton, Snow uses her experience as an archer and the students are in awe, winning her confidence with them. At the end of the school day, Shirin later meets up with the Oracle in the woods, where they are coordinating plans to search for Aladdin, as Shirin is revealed to be Princess Jasmine.
- Mr. Gold's haircut was due to Robert Carlyle filming Transporter 2 at the time, so it was written in to avoid having him wear a wig all the time.
- Hook has officially moved out of the Jolly Roger and in with Emma.
- This is the final appearances of both Mr. Hyde and Dr. Jekyll due to their deaths.
- It is also revealed that Jeykll is the evil one, not Hyde.
- This is the only time Jasmine appears without Aladdin.
- Regina learns suicide is the only way to stop the Evil Queen; due to the serum linking their lives.