In the series finale, Helena prepares to deliver in the basement of Old Dyad while Sarah and Art fight to protect her from Neolution.
This episode contains examples of:
- And Then What?: Now that the clones are free of Neolution forever, Sarah is struggling to figure out what to do with her life now that there's no conspiracies left to fight and nothing to keep her mind off grieving Mrs S. To say nothing of Rachel, who skips town with a glass eye and an utterly blank slate for her future.
- Artistic License – Biology: Rachel's new glass eye moves with her regular eye.
- Back for the Finale: Mrs. S might be dead, but she still gets to appear in some final flashbacks.
- Charlotte appears as well, along with Alison's kids.
- Bait-and-Switch: When Felix meets up with Rachel, she is in the back seat of a very expensive car. When Felix asks if she has gotten back to her own ways by getting a manservant, Rachel tells him the car is an Uber rental.
- Bittersweet Ending: Neolution is gone for good, Helena's babies are born, and the Ledas are free. But Sarah is still grieving her foster mother's death and struggling to figure out what to do with her life now that there's no longer a conflict to give her something to focus on.
- On a more specific note, Rachel may have redeemed herself in the end, but she's burned too many bridges with the other clones for her to be part of their future.
- Call-Back: Helena's baby shower is almost exactly like the one she hallucinated back in Season 3.
- Tony gets a mention again when Cosima reveals that she's already found him and given him and Krystal the cure.
- Celebrating the Heroes: The party at the end is as much a celebration of finally being free of Neolution as it is for Helena's babies.
- Clean, Pretty Childbirth: Helena giving birth to her babies is relatively clean.
- Colourful Theme Naming: Before she names her babies, Helena calls them Orange and Purple.
- A Day in the Limelight: As Sarah is the main protagonist, it is fitting that the final episode is solely based on her point of view.
- Earn Your Happy Ending: And how. The last leaders of Neolution are dispatched in the first fifteen minutes, and the last we see of Helena, she's finally happy with her two little boys.
- Easily Forgiven: Averted. While Rachel may have defected from Neolution, the sestras aren't ready to immediately forgive her for everything she's done to them before her final Heel–Face Turn.
- Extreme Omnivore: According to Helena, her babies keep eating sand, even though she has no clue where the sand comes from.
- Flash Back: The final episode shows flashbacks to Sarah giving birth to Kira.
- Food End: Fittingly, the last half of the episode is dedicated to a backyard barbecue at the Hendrixes' house for Helena's baby shower.
- Karmic Death: John and Coady are both killed by the Clones whose lives they've been screwing around with.
- Kick the Dog: John's nurse, who is helping with John's health—i.e. on John's side—implies that John's advanced age limits what he's capable of. John gets offended and shoots him (to show, once again, how evil he is).
- Killed Off for Real: John and Coady are both killed off for real.
- Leaning on the Fourth Wall: Similar to many fans, not even the other clones can make sense of the term "Orphan Black".
- Meaningful Name: Helena names her twin sons after "real men" - Arthur and Donnie.
- "Near and Dear" Baby Naming: Helena names her twin sons after her friend Art and her brother-in-law Donnie because they're "real men".
- Persona Non Grata: Rachel isn't welcome at the party because despite her Heel–Face Turn 3 episodes ago, she's burned too many bridges before that point for her to be forgiven so quickly.
- Pet the Dog: Rachel gives the names and locations of all the Leda clones to Felix, who in turn gives it to the Clone Club.
- Pregnant Badass: Helena again, this time killing Dr. Coady while giving birth!!!
- Recursive Canon: Helena titles her memoirs Orphan Black.
- Shut Up, Hannibal!: Sarah does this to John by shooting him. And then she bashes him in the head with an oxygen tank. Followed by telling him to shut up.
- Slashed Throat: How Helena finally kills Coady. In the middle of childbirth, no less.
- Walking the Earth: Near the end of the episode, Cosima and Delphine leave to give the cure to the other Leda clones.
- What Happened to the Mouse?: Art ties up Enger, but after she's found by the other Neolution guards, she's never seen or mentioned again. Given that she's still unconscious when they find her and most people recover from being knocked out in just a few seconds if they're going to recover at all, she could well be comatose. Likewise for the previous episode suggested that Art was under investigation by Interpol for his involvement with the whole scandal, but was never addressed.
- The fate of other characters isn't fully explained in the finale. Most glaring is Mud, as we don't know what her fate is beyond Revival. Also, we don't know what happened to Kira's biological father Cal, as we last saw him at the end of Season 3 with Sarah and Kira in Iceland before Neolution attacked their refuge at the start of Season 4. Finally, Krystal and Tony are only referred to by pictures pinned up against the wall.
