Krux Krux , also known as Dr . Sander Saunders , is one of the Time Twins and the older brother of Acronix . Personality . Krux is a patient schemer , having spent forty years orchestrating his plan to take revenge for his defeat and that of his brother Acronix . He also despises the various technological innovations that have taken place over that time , preferring the simpler times of the past . History . 40 years prior to the events of Hands of Time , Krux and his brother Acronix were the original Elemental Masters of Time . While Acronix could go forward in time and slow down time , Krux could go back in time and pause time completely . He used these powers to great advantage ; going back in time seconds before an opponent could make a move and turning the battle in his favor . After the Serpentine were defeated by the Elemental Alliance , Krux and Acronix , knowing that they were more powerful than the other Elemental Masters , decided to betray the alliance and use their powers to control all of Ninjago . The other Elemental Masters fought against Krux and Acronix , but the two proved too powerful . With the Time Blades forged by Ray and Maya , Wu and Garmadon fought a lengthy battle against the Time Twins at the Monastery of Spinjitzu . Eventually , Wu and Garmadon used the Time Blades to absorb Krux and Acronix ' s elemental powers , rendering them normal men . Knowing that the power to control time was dangerous , Wu and Garmadon used the Time Blades to open a vortex that would leave the Time Blades lost forever . However , Krux and Acronix decided to go through the vortex themselves , which left the two " lost to time . " While Acronix would be lost in the time vortex for 40 years , Krux was somehow immediately teleported back to Ninjago , along with the Reversal Time Blade . Krux then took on the false identity of Dr . Sander Saunders and used eggs from the Great Devourer to breed an army . Krux ' s army would need weapons and armor , and he knew exactly who could make them . Under the disguise of Dr . Saunders , Krux took his time to become a trusted friend of Ray and Maya . One day , Krux revealed his true identity to the Masters of Fire and Water , and threatened to harm Kai and Nya should they refuse to do his bidding . The Dark Island Trilogy . The epilogue of " The Dark Island Trilogy " features Krux alongside his brother Acronix in a vision experienced by Sensei Wu , who describes the pair as " the twins I thought lost to time . " Day of the Departed . As Dr . Saunders , he friendly greeted the Ninja when they arrived at the Ninjago Museum of History and gave them a tour of the new Hall of Villainy exhibit . Later that night , Saunders was present at the Day of the Departed concert with Dareth . After Dareth defeated the resurrected Kozu and his Stone Warriors , Saunders expressed extreme displeasure at the damange to his museum caused by the conflict . Pythor ' s Revenge . When the Ninja were called to the museum to help clean up the damage from the night before , Saunders became hysterical when he realized that his thermostat had been destroyed . When the Ninja questioned Saunders about why his thermostat was so important , he simply claimed that the museum needed to be kept at a certain temperature to preserve the exhibits . After the Ninja took back the BorgWatch prototype from Pythor , they used it to repair the original thermostat . Saunders was happy that his thermostat was working again , but expressed his dislike for modern technology . Zane then noticed an ancient - looking watch that Saunders kept in the museum , and Saunders said that he used the watch to tell time for many years . After the Ninja left , Saunders listened to the humming sound coming from the museum basement . The Hands of Time . As the Ninja were cleaning up the Ninjago Museum of History , Krux ( disguised as Dr . Saunders ) presented the Ninja with refreshments . When the Ninja questioned him about a painting showing Wu and Garmadon in their younger years fighting two mysterious warriors at the Monastery of Spinjitzu , Saunders explained that the two warriors were the Hands of Time , but that they were merely a myth . Later , Saunders was confronted by Acronix . Saunders took off his mustache and hugged his brother , revealing that he was actually Krux in disguise . The Hatching . At his lair in the museum , Krux was extremely annoyed by his brother ' s growing fondness for the modern inventions that he never got to experience , such as the BorgWatch and the BorgPad , and Krux claimed that he despised modern life . Krux showed Acronix a helmet and said that he would return Ninjago to its " pre - modern glory " ; revealing the Vermillion eggs . Later , Krux unleashed a Vermillion warrior at the big unveiling of the BorgWatch ; commanding it to destroy the Borg Store and to kidnap Cyrus Borg himself . When the Ninja arrived , Krux unleashed two more Vermillion warriors . While the Ninja fought off the Vermillion at the Borg Store , Zane and Borg fled the scene , only to be confronted by Krux in the disguise of Dr . Saunders . With Acronix by his side , the two kidnapped Borg and took him back to the museum . Back at the museum , Acronix expressed his displeasure that they had lost most of their armor for the Vermillion in the battle against the Ninja . However , Krux assured his brother that he already had his " best blacksmiths " working on more armor . Krux then revealed that he had released hundreds of Vermillion eggs into the swamps of Ninjago through the sewer beneath the city . A Time of Traitors . After locking Cyrus Borg in a Serpentine coffin , Acronix questioned Krux as to how they planned to control the growing force of Vermillion that they needed for " phase two " of their plan . Reminding his brother that he had 40 years to devise the plan , Krux then introduced Commander Raggmunk , Commander Blunck , and General Machia ; three Vermillion selected from the genetically superior of Serpentine who were thus able to control the other Vermillion warriors telepathically . When Krux was informed by Raggmunk that Kai had entered the museum , he allowed Acronix to monitor the Ninja through a telescope that he had built into a snake statue . Noticing that Kai had taken a Vermillion helmet , Acronix feared that the Ninja of Fire was onto their plan and insisted that he neutralize him . Knowing that it would draw too much attention , Krux declared that he would attend to the matter himself and ordered the Vermillion commanders to commence phase two of the plan . Disguised as Dr . Saunders , Krux confronted Kai . When Kai asked if he recognized the Vermillion helmet , Saunders said that it resembled a post - Serpentine War samurai helmet , but was likely a knockoff . Kai explained that he obtained the helmet during the battle against the Vermillion that attacked the Borg Store and asked if Saunders had seen it on TV . This prompted Saunders to explain that he despised TV , reverting to his normal voice of Krux for a brief moment . Kai eventually realized that the Vermillion helmet was identical to the helmets worn by Krux and Acronix in the painting . When Saunders tried to convince Kai that the Time Twins were still a myth , his fake mustache ended up tangled in a snake statue and fell off ; revealing his true identity . A lengthy battle between Krux and Kai ensured , during which Kai discovered that Krux had kidnapped Cyrus Borg and had likely taken Zane as well . As the battle continued , Krux claimed that Kai and Nya ' s parents were actually traitors who fought with the Time Twins . Due to Kai ' s anger , Krux briefly gained the upper hand when Acronix revealed himself and prepared to finish off the Ninja of Fire with the Forward Time Blade . However , Nya arrived and helped Kai in the continuing battle . Eventually , Krux was kicked into the same Serpentine coffin that Borg had previously been locked in . Scavengers . Krux and Acronix , along with the Vermillion army , appeared in Wu ' s dream . After the Vermillion hoarded all of the metal they could find in Ninjago City , Krux and Acronix led them through the sewers to their secret lair . When the Time Twins found themselves lost , Acronix gloated that his BorgWatch had built - in GPS . However , the BorgWatch was unable to function because there was no service , and Krux then gloated that this was one of many reasons why he refused to " get with the times " . Krux then decided to follow his map , only to be led to a dead end . A Line in the Sand . Krux and Acronix put Cyrus Borg to work building a machine that employs the power of the Time Blades . When the Slow Down Time Blade arrives , they quickly redirect their forces to seize it . However , Raggmunk and Blunck lose it to the Ninja , but the Time Twins and Machia are confident that they can recover it . The Attack . After berating Blunck and Raggmunk for their disobedience and failure , Acronix and Krux lead their forces in an attack on the Temple of Airjitzu where the Ninja reside and keep the Time Blade they have recovered . Eventually the pair engage the Ninja in battle directly , only to lose the Fast Forward Blade . However , Machia is able to reclaim both blades from the overconfident Ninja , and the villains escape with them and a captured Wu . Secrets Discovered . On their way back to their swamp lair , Krux and his brother promote Machia over Blunck and Raggmunk . Pause and Effect . Alerted to the imminent arrival of the Pause Time Blade , Acronix and Krux depart to retrieve it with Machia and Borg in tow . Ray and Maya , upon being found by Kai and Nya , reveal that Krux returned to Ninjago much earlier than his brother and gained their trust while under the identity of Dr . Saunders . He then blackmailed them into helping him in his plans for revenge , threatening harm to Nya and Kai if they refused to comply . Unfortunately , the Time Twins return to their camp and break in on the family reunion , and then force Kai and Nya to help them recover the last Time Blade . Out of the Fire and Into the Boiling Sea . Krux and Acronix take Ray , Maya , Kai , Nya , and Wu to the Boiling Sea , and send Kai and Nya into the hostile environment to recover the Reversal Time Blade . Upon their successful return , Krux double crosses them , having never intended to allow them to help Wu with the blade ; after the heroes are frozen with the Pause Blade , the Time Twins and Machia leave them to plummet into the water . They then return to their camp and , after thwarting Samurai X and Zane ' s attempts to destroy the Iron Doom , board the craft with their army . Lost in Time . Using their new vehicle , the Time Twins land with their Vermillion in Ninjago ' s past , shortly after the departure of their own past selves , and attack the Elemental Masters of that era . Kai and Nya , who have followed them with Wu in tow , manage to help the past Elemental Masters turn the tide , only for Krux and Acronix to seize direct control of the Vermillion . Using the hordes of snakes to animate the Iron Doom , they overwhelm the Elemental Masters , but are then attacked by the Fusion Dragon . At Acronix ' s suggestion , they then attempt to travel into the distant future so as to be rid of their adversaries forever . However Kai , Nya , and a healed Wu are able to board the Iron Doom and face them , and the Iron Doom is sent tumbling out of control after Wu removes the Reversal Blade . Kai and Nya are able to return to the present , while Wu , the Time Twins , and the Vermillion remain aboard the Iron Doom as it plummets through time .