In the final season of Sweet Tooth, Gus and Big Man head to Alaska to find Birdie and a cure for the Sick. The series is streaming on Netflix.
Warning: This article contains heavy spoilers
Plot summary:
Gus, Jepp, Becky, and Wendy are driving toward Alaska but have a long way to go and Jepp is nervous about the journey.
Helen Zhang has put out a bounty for information on Gus and sent out her daughter Rosie to find him.
She wants to end hybrids and restart human birth so that her daughter Ginger gives birth to a “normal” baby.
Dr. Singh is obsessed with his dream and tries to catch up to Gus to fulfill his destiny of getting to the cave.
Birdie is giving up on finding the cave and wants to look for Gus instead. She says her goodbyes to Siana and Nuka and heads back to her place to pack up.
Over a hundred years ago, the explorer Robert Thacker found the cave, and whatever he did in there started the Sick and the hybrids.
Birdie got her hands on his journal and she gave it to Nuka when she left. A man waits for Birdie at her place and goes chasing after her in the snow.
She loses track of him after getting shot with a tranquilizer and a strange creature finds her and drags her away.
Rosie is tracking Gus with her wolf-hybrid sons. She gave birth to quadruplets but Helen never accepted her grandchildren as normal.
Instead, they were raised to be feral hunting creatures who wore muzzles and followed commands.
Rosie does her best to gain her mother’s recognition but constantly being one step behind Gus and his friends draws her mother’s ire.
Dr. Singh catches up and tells Gus that he saw the same dream. Gus agrees to bring him along with them but Jepp and Becky aren’t so trusting of him.
Gus finds out that there’s a ship leaving from Nag’s Reef headed to Canada so they try to get there as soon as possible.
They meet a family who were hiding their son’s hybrid features and had another child on the way.
Dr. Singh helps them deliver the baby but the father calls Rosie for the bounty. They manage to escape before she arrives, but she learns where they are headed.
They reach the coast an hour after the ship Whalesong has left but Gus finds a small boat and convinces them to fix it up and head out after it.
Becky and Jepp plan to leave Dr. Singh behind but Rosie arrives to disrupt plans. Gus, Dr. Singh, and Jepp make it onto the boat and escape.
Becky and Wendy are left behind and Becky ends up killing one of the wolf boys that attack them.
Rosie is devastated to lose one of her sons but Helen is focused on questioning Becky to find out where Gus is gone.
Wendy hides and follows Helen’s men to break Becky out when the time is right. Becky meets Jordan who is now a part of Helen’s crew and he tries to help her.
He’s actually pretending and learns that Gus is headed to Alaska. Helen begins preparations to fly there.
Siana and Nuka go put looking for Birdie but have not luck. She was taken in by the Caribou Man, a hybrid who was a myth uptil then.
Gus reaches the Whalesong but they find the ship deserted and shut down. They realize that the Sick has spread on the ship and Jepp and Dr. Singh have to lock themselves in.
Gus hears one survivor on the walkie talkie and Gus tells him that he’ll get rid of all the plants and bodies so that they can start the ship again.
He clears them all out after gathering things to remember them by and the survivor sets a course for Alaska before sacrificing himself because he also has the doomsday virus.
They reach Alaska in a few days and meet Siana and Nuka who get them up to speed. Helen and her men arrive too, with Wendy sneaking onto the plane.
While Siana helps Gus plan a way to find Birdie, Helen prepares to attack the outpost. Gus makes it out but the rest are stuck inside.
Dr. Singh betrays the others and tells Helen that he knows where Gus went because it is his destiny to be there with him.
Wendy saves Becky and they head out to find Gus and Jepp. The wolf boys go after Gus but he is saved by the Caribou man.
He is wounded but he takes Gus back to the church where he finally gets to meet Birdie. The man explains that his name is Munaqsriri and he is Iqiaq’s son, a woman who sailed with Robert Thacker.
He has lived for 100 years keeping humans away from the cave because the Sick was nature’s way of ending their reign of tyrany.
Jepp finds his way to Gus and Birdie, while Siana and the others plan to take back the outpost from Helen’s men.
Becky and Wendy meet up with them and offer their help too. Helen finds a big extractor called The Beast at the outpost and wants to start it up so that she can take the blood of the Earth for herself.
The story comes to a head at the cave where Gus, Birdie, and Jepp find an antler tree with Thacker’s axe embedded inside.
Gus wants to take it out and end the sick, but Birdie says that it might end the hybrids too so he should think before making a decision.
Helen shows up with Dr. Singh and he get ready to sacrifice Gus like he was destined too, but Birdie jumps in the way.
Helen’s men start The Beast and head to the cave with Becky and the others chasing after them.
Ending explained:
Stopping the beast
Jordan drives the beast with Rosie, Ginger, and her husband driving behind them to the cave.
Siana and two of her friends chase after them with Becky and Wendy not far behind. Nuka’s father used to hunt whales and they take his harpoon gun to stop the beast.
One of them shoots the fuel tank but it doesn’t drain out quickly enough. Becky gets onto the truck and restrains one of the wolf boys.
She climbs into the passenger seat and struggles with Jordan till the Beast is overturned. She and the wolf boy survive, but Jordan doesn’t.
Changing destiny
Dr. Singh starts to doubt himself after killing Birdie but Helen pushes him to complete his destiny and redeem himself.
She stabs Jepp when he tries to stop them and Gus has no one left ot help. Dr. Singh has a change of heart at the final moment and helps Gus instead of killing him.
Helen gets frustrated and pulls out Thacker’s axe to attack them but she lets out the blood of the Earth and every human immediately gets the Sick.
Gus cuts himself and presses his hand against the tree to stop it but he is transported to a different place where he sees Pubba.
He has a conversation with Pubba about the good and bad in humanity and how it shouldn’t all upon him to make such a difficult decision.
A second chance
Jepp calls out to Gus and he wakes up. He pulls out a flare and burns the tree which stops the Sick.
The cave begins to collapse and everyone rushes out. Gus is about to get crush when Dr. Singh pushes him out of the way and truly redeems himself.
The Beast crashes outside the cave and Becky and Wendy help the restrained wolf boy. Rosie lets them go and rushes to Ginger who is about to give birth.
Everyone makes it out of the cave just as Ginger gives birth to a hybrid child. Helen is the only one disappointed and everyone else abandons her.
Some of her men stay at the outpost to help Siana rebuild. Rosie and her family head back to Texas with a new perspective on life.
Gus’s decision to burn the tree left the choice in nature’s hands. It gave the remaining humans another chance, but ensure they were the last humans ever.
Gus, Jepp, Becky, and Wendy head back to Yellowstone to rejoin the other hybrids and build a community for themselves called the Sanctuary.
Gus and Wendy grow old there, telling their story to their children and grandchildren and keeping the memory of everyone they loved alive.
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