Seeds of Doubt

Seeds of Doubt is the main Easter Egg in the Zombies map Zetsubou No Shima that appears in Call of Duty: Black Ops III. It requires the player to "save" the original Takeo Masaki. It is possible to complete this Easter Egg with any number of players, including solo.
== Prerequisites ==
Before starting the Easter Egg, the Skull of Nan Sapwe must be obtained and at least one player must have the Anywhere But Here! GobbleGum in their inventory to complete the easter egg.
Throughout the course of the Easter Egg, the following will be required:
*KT-4, later upgraded to the Masamune
* Gas Mask
* Zombie Shield
* All Trials of the Ancients completed by every player
* At least 1 Bucket
* At least 2 Seeds (1 for Masamune upgrade plant; additional Seeds for cog 2 below)
== Step 1: Revealing the Blueprint and Elevator Machinery ==
Once the players have obtained the Skull of Nan Sapwe, a player must go down to the Living Quarters in the Bunker and go over to where the purple water is. Using the skull, the player must mesmerize a piece of paper on the wall across from the purple water, which will reveal the second half of the paper. This will now allow players to remove secret walls and doors hidden on the map.
Across from the door leading to the anti-aircraft platform is an inpoerable elevator. Directly to the left of the elevator by the corner is a piece of wall that can be opened using the Skull of Nan Sapwe. The player must use Mesmerize the door, which will disappear, revealing a broken generator powering the elevator, which is missing three Cogs.
== Step 2: Gathering the Cogs ==
These cogs can be collected in any order.
===Cog 1===
The player must use the Anywhere But Here! GobbleGum to teleport to a secret room above Lab A. There, the player can find one of the three cogs on the ground. The player can then pick up the cog and can either use the Anywhere But Here! GobbleGum or use the hole in the side of the wall to exit the room.
The GobbleGum can sucessfully be used after the door to the elevator was mesmerized.
===Cog 2===
For this step, the player must have a bucket and at least one seed. Plant the seed, then water the plant with blue water and shoot it with the KT-4 once every round for three rounds. Once the plant is fully grown, opening the pod may reveal a flak shell which can be inserted in the FlaK 88 cannon at the anti-aircraft platform. As the shell is not guaranteed even with this method, growing at least three seeds at once is highly recommended.
The shell can be loaded in the cannon at its back by holding the action button, which produces a sound effect. Once the shell is in the cannon, the player must wait for a cargo plane to fly over the map. This plane cycles across the map roughly every two/two and a half minutes. When the plane is in sight and lined up with the barrel of the cannon, the player must hold the action button on the FlaK 88, which will fire the round at the plane, destroying it. The FlaK 88 cannot be swiveled or aimed, so this must be eyeballed for an accurate shot.
Once the plane is destroyed, a smoke trail will fall to the map, where players can roughly see where it lands. The cog can be located in one of these three locations with a smoky aura emanating from it to make it easier to identify:
* Outside the entrance to the Bunker, by the large tree between the Seed planter and the Bowie Knife.
* By the back staircase leading up to the Zipline by Lab A.
* By the meteorite behind Lab B, close to the wheelbarrow and green water pool.
Note: If the player shoots and misses the plane, the shell must be recollected again by growing another plant.
===Cog 3===
All players in the game must complete all of their Trials of the Ancients located at the area where the skulls can be found. Once all the challenges are done, lightning will strike the platform periodically. To do this step, the player must stand on the platform with the Zombie Shield equipped while the lightning is affecting the platform. Once done, the player must head over to the zipline between Lab A and the Docks. The cog is on the small dock underneath the zipline, which can be reached in two ways:
*In solo, the player with the electrified shield shocks the zipline control panel (by meleeing it) and uses the zipline. When they are over the dock, they must press the melee button, which will cause the player to drop off the zipline onto the dock.
*In co-op, one player uses the zipline, while the player with the electrified shield shocks the control panel again while the other player is over the dock, causing them to fall off. 
Note: It is safest to do this step when starting from the Docks when looking up towards Lab A, as one can electrify the panel, get on the Zipline, and immediately melee, avoiding the possibility of the player on the Zipline accidentally falling into the large instant death zone.
==Step 3: Activating the Elevator and Fighting the Giant Thrasher==
Once all three cogs are collected, bring the cogs to the generator in the room behind the elevator and hold the action button on the generator, which will make the elevator functional. 
Before going down the elevator, all players must have a Gas Mask equipped or they will be guaranteed to go down. At least one player must now possess the upgraded KT-4, the Masamune.
It is additionally recommended to have a GobbleGum that directly helps in a pinch such as In Plain Sight or Self Medication, a fresh electrified Zombie Shield, and plenty of ammo on other weapons. Having Spider Bait available as another option will also be of great help.
When ready, all of the players must go into the elevator and use it, which will then take them to a secret part of the Bunker. The player with the Masamune must shoot the three vines in the path at the glowing part leading to a door at the end of the hallway.
Once the players enter the door, a massive, unique looking Thrasher can be found held captive in a giant cage. In order to start the battle, the player with the Masamune must shoot the weakspot spore on one of the Giant Thrasher's arms, which will begin the boss battle. There are 4 total weakspot spores to shoot, denoted by the vines reaching from the cage, each being timegated. This section cannot be sped up and takes several minutes, regardless of player performance.
In between the time it takes for another weakspot spore to show, the players must survive a constant onslaught of zombies, Spiders and Thrashers before another spore will appear on one of the arms of the Giant Thrasher, who will occasionally do a vine slam down the center of the room. It is not at all required to kill these spawned enemies and one can simply train, but it is advised to kill at least some due to how chaotic it can get. 
When a new weakspot is revealed on the giant Thrasher, the player with the Masamune must shoot the spore directly and repeat the process until the Giant Thrasher is killed. Once it is killed, the ending cutscene will activate for the players.
==Ending Cutscene==
Primis Takeo looks into one of the prison cells, noticing Ultimis Takeo being held captive, who in return recognizes Primis Takeo as his alternative self. He remarks how he has won many battles and become a hero, but his victories were not welcomed; Primis Takeo shares some of these memories. He is outraged at the conditions Ultimis Takeo was put in, believing it was beyond acceptable punishment and wondering who could inflict such suffering on someone. Ultimis Takeo reveals that he was betrayed and ordered to imprisonment by the Emperor himself, which shocks and disillusions Primis Takeo, who had been always loyal to him. He suggests that Ultimis Takeo helps them secure a better tomorrow, to which he agrees, by committing with Primis Takeo as his . His soul is then collected by the Summoning Key, and Richtofen briefly teleports the four somewhere and back to set a chain of events in motion—something he refers to as an "insurance policy".
Seeds_of_Doubt_achievement_image_BO3.jpg|Xbox One achievement image
Zetsubou No Shima ending cutscene
==Rewards==
Upon completion, players will be given all perks on the map (Quick Revive, Juggernog, Double Tap II, Speed Cola, Mule Kick, Electric Cherry, Widow's Wine, Stamin-Up, and Deadshot Daiquiri), and will be spawned back into the final boss arena where enemies will begin spawning. Players need to go back to ride the elevator to return to the main part of the map.
* Perk Slots are not increased, and all perks will be lost upon being downed unless the player uses the Phoenix Up/Near Death Experience Gobblegum to revive teammates or the player has the Aftertaste/Self Medication Gobblegum activated. Players will still retain 5 Perk Slots if they claimed their reward from their topmost Trial of the Ancients.
The Seeds of Doubt achievement will also be unlocked. It will also give 5000 XP (for which the reward title is "Horticultural Heroism"), and a Gateworm icon on the map selection screen.
==Trivia==
*Upon completion of this Easter Egg, all characters will now possess two blood vials on their character model. Dempsey and Nikolai keep their blood vials on their sides, while Takeo keeps his vials on the side of his backpack.
== Videos ==
"ZETSUBOU NO SHIMA" EASTER EGG GUIDE! - FULL EASTER EGG TUTORIAL WALKTHROUGH! (Black Ops 3 ZOMBIES)
Category:Easter eggs
Category:Call of Duty: Black Ops III Zombies Main Quests