White Gate Keys are required to Duel him at the Gate.
He appears in-game after the player reaches Stage 6 of Duel World (5D), at which point his Character Unlock Missions become available. Prior to May 10, 2019, he could only be unlocked during his event, Atlas Rising: The Return of Jack Atlas. Prior to that, he appeared during one special event as a Roaming Duelist.
When starting a Duel with Yusei Fudo, Jack says "Yusei! I'll put my very soul into this Duel!", followed by "So no one will pose a challenge! Not even you!"
When he wins the Duel, Jack says "Yusei! Only I rule the Duel! As the one true King!"
When he loses the Duel, Jack says "So this is the bond you have with your monsters...", followed by "You've woken something new inside me, Yusei!"
Crow Hogan, Akiza Izinski, Luna
When starting a Duel with Crow Hogan, Akiza Izinski, or Luna, Jack says "We've achieved all we can as a team.", followed by "So I'll tackle new challenges solo from now on!"
When he wins the Duel, Jack says "I want to test my skills on the world stage!", followed by "And I'll defeat anyone who sands in my way! Even Team 5D's!"
When he loses the Duel, Jack says "Seems you've given me a reason to come back here.", followed by "I'll win next time. Humph!"
Leo
When starting a Duel with Leo, Jack says "We've achieved all we can as a team.", followed by "So I'll tackle new challenges solo from now on!"
When he wins the Duel, Jack says "I want to test my skills on the world stage!", followed by "And I'll defeat anyone who sands in my way! Even Team 5D's!"
When he loses the Duel, Jack says "Argh... Leo! Don't you dare think you're better than me! Not even for a moment! Got it?"
Dark Signer Kalin Kessler
When starting a Duel with Dark Signer Kalin Kessler, Jack says either "The Mark of the Dragon yearns to Duel a Dark Signer." followed by "And I shall grant its wish!", or "You're... Kalin?"
When he wins the Duel, Jack says "Earthbound Immortals are nothing against the true King!"
When he loses the Duel, Jack says "This won't go unforgiven, Dark Signer!"
Dark Signer Carly Carmine
When starting a Duel with Dark Signer Carly Carmine, Jack says "Carly... Even if it costs me everything, I will save you!"
When he wins the Duel, Jack says "You have to remember, Carly!", followed by "This dark scourge isn't you!"
When he loses the Duel, Jack says "No... This can't be... From the depths of my heart...", followed by "I'll find a way to save you yet..."
Dark Signer Rex Goodwin, Earthbound Immortal Ccarayhua, Earthbound Immortal Chacu Challhua, Earthbound Immortal Cusillu, Earthbound Immortal Uru
When he wins the Duel, Jack says "Earthbound Immortals are nothing against the true King!"
When he loses the Duel, Jack says "This won't go unforgiven, Dark Signer!"
Kalin Kessler
When he wins a Duel with Kalin Kessler, Jack says "You're a mere speed bump on my way to my true opponent!"
Carly Carmine
When starting a Duel with Carly Carmine, Jack says "An exclusive interview?", followed by "...Very well. I'll grant you a moment of the King's time."
When he wins the Duel, Jack says "Tell your editor to leave the front page open!", followed by "For a full-page spread on the Master of Faster, Jack Atlas!"
When he loses the Duel, Jack says "You say that as the King, I must now treat you as my queen?", followed by "......No, I can't do that! Stop trying to trick me!"
Before Jack Synchro Summons "Hot Red Dragon Archfiend Bane", he announces "Mountains will crumble as the land is engulfed in flames!", followed by "Synchro Summon!" When Jack Summons "Hot Red Dragon Archfiend Bane" (by any method), a cut-in frame of Jack briefly appears, and he announces "Hot Red Dragon Archfiend Bane!"
Most of the time when Jack attacks with that monster, he announces "Attack, Hot Red Dragon Archfiend Bane!", followed by "Great Summit Breaker!"
When Jack activates either of that monster's effects, he announces "Hot Red Dragon Archfiend Bane's effect activates!"
Before Jack Synchro Summons "Red Dragon Archfiend", he announces "Witness why I am known as the true King!", followed by "Synchro Summon!" When Jack Summons "Red Dragon Archfiend" (by any method), a cut-in frame of Jack briefly appears, and he announces "My soul! Red Dragon Archfiend!" If its Summoning animation has not already played this Duel, a cutscene of "Red Dragon Archfiend" being Summoned plays afterwards.
Most of the time when Jack attacks with that monster, he announces "Attack, Red Dragon Archfiend!", followed by "Absolute Powerforce!"
When Jack activates that monster's first effect, he announces "Red Dragon Archfiend's effect!", followed by "Fiend Meteor!"
When Jack activates that monster's second effect, he announces "Red Dragon Archfiend's effect activates!"
Before Jack Synchro Summons "Red Nova Dragon", he announces "Behold as the stars high above in the sky... And the fire deep down below in the earth... Collide in a cosmic explosion to Synchro Summon!", then the Double Tuning animation is played instead of the standard Synchro Summon animation. When Jack Summons "Red Nova Dragon" (by any method), a cut-in frame of Jack briefly appears, and he announces "Rise! Red Nova Dragon!"
Most of the time when Jack attacks with that monster, he announces "Red Nova Dragon! Attack!", followed by "Blazing Soul Strike!"
Before Jack Synchro Summons "Celestial Wolf Lord, Blue Sirius", he announces "The lone wolf with blue eyes incinerates the heavens!", followed by "Show these lapdogs who bears the fangs! Synchro Summon!" When Jack Summons "Celestial Wolf Lord, Blue Sirius" (by any method), a cut-in frame of Jack's face briefly appears, and he announces "Celestial Wolf Lord, Blue Sirius!"
Most of the time when Jack attacks with that monster, he announces "Celestial Wolf Lord, Blue Sirius attacks!", followed by "Wolf's Fang!"
When Jack activates that monster's effect, he announces "Celestial Wolf Lord, Blue Sirius's effect!", followed by "Blue Sublimation!"
Before Jack Synchro Summons "Chaos King Archfiend", he announces "The new sovereign emerges from the chaos!", followed by "Synchro Summon!" When Jack Summons "Chaos King Archfiend" (by any method), a cut-in frame of Jack's face briefly appears, and he announces "Chaos King Archfiend!"
Most of the time when Jack attacks with that monster, he announces "Attack, Chaos King Archfiend!"
When Jack activates that monster's effect, he announces "Chaos King Archfiend's effect!"
Before Jack Synchro Summons "Crimson Blader", he announces "This red blade announces the King's verdict! Surge with the flames as I Synchro Summon!" When Jack Summons "Crimson Blader" (by any method), a cut-in frame of Jack's face briefly appears, and he announces "The fire deity, Crimson Blader!"
Most of the time when Jack attacks with that monster, he announces "Crimson Blader attacks! Red Slayer!"
When Jack activates that monster's effect, he announces "Crimson Blader's effect activates!"
Before Jack Synchro Summons "Exploder Dragonwing", he announces "As the King roars, feel the crushing blow of victory!", followed by "Synchro Summon!" When Jack Summons "Exploder Dragonwing" (by any method), a cut-in frame of Jack's face briefly appears, and he announces "Spread your wings, Exploder Dragonwing!"
Most of the time when Jack attacks with that monster, he announces "Exploder Dragonwing! Attack!", followed by "King Storm!"
When Jack activates that monster's effect, he announces "Exploder Dragonwing's effect activates!"
When Jack Summons "Majestic Dragon", a cut-in frame of Jack's face briefly appears, and he announces "The Tuner Monster arrives! Majestic Dragon!"
Most of the time when Jack attacks with that monster, he announces "Majestic Dragon attacks!"
When Jack Summons "Red Dragon Archfiend/Assault Mode", a cut-in frame of Jack's face briefly appears, and he announces "The conqueror emerges, clad in scorching armor!", followed by "Appear before me, Red Dragon Archfiend/Assault Mode!"
Most of the time when Jack attacks with that monster, he declares "Attack, Red Dragon Archfiend/Assault Mode!", followed by "Extreme Crimson Force!"
When Jack activates that monster's first effect, he announces "Red Dragon Archfiend/Assault Mode's effect activates!", followed by "Crimson End!"
When Jack activates that monster's second effect, he announces "Red Dragon Archfiend/Assault Mode! Resurrect my monster!"
Before Jack Synchro Summons "Stardust Dragon", he announces "With the wings of wind, I Synchro Summon!" When Jack Summons "Stardust Dragon" (by any method), a cut-in frame of Jack's face briefly appears, and he announces "Roar, Stardust Dragon!"
Most of the time when Jack attacks with that monster, he announces "Stardust Dragon! I command you to attack!"
When Jack activates that monster's Quick Effect, he announces "Witness Stardust Dragon's effect!"
When Jack activates that monster's Trigger Effect, he announces "Stardust Dragon's effect activates! Resurrect!"
When Jack Summons "Big Piece Golem", he announces "Come out! Big Piece Golem!"
Most of the time when Jack attacks with that monster, he announces "Big Piece Golem attacks!", followed by "Power Pressure!"
When Jack Summons "Clock Resonator", he announces "The Tuner Monster, Clock Resonator"
Most of the time when Jack attacks with that monster, he announces "Clock Resonator attacks!"
When Jack Summons "Creation Resonator", he announces "The Tuner Monster, Creation Resonator"
Most of the time when Jack attacks with that monster, he announces "My Creation Resonator attacks!"
When Jack Summons "Dark Resonator", he announces "The Tuner Monster, Dark Resonator"
Most of the time when Jack attacks with that monster, he announces "Attack! Dark Resonator!"
When Jack Summons "Double Resonator", he announces "The Tuner Monster, Double Resonator"
Most of the time when Jack attacks with that monster, he announces "Double Resonator attacks!"
When Jack activates either of that monster's effects, he announces "Double Resonator's effect activates!"
When Jack Summons "Flare Resonator", he announces "The Tuner Monster, Flare Resonator!"
Most of the time when Jack attacks with that monster, he announces "Flare Resonator attacks!"
When Jack Summons "Force Resonator", he announces "The Tuner Monster, Force Resonator!"
Most of the time when Jack attacks with that monster, he announces "Force Resonator attacks!"
When Jack activates that monster's effect, he announces "Force Resonator's effect!"
When Jack Summons "Gash the Dust Lord", he announces "Come forth, Gash the Dust Lord!"
Most of the time when Jack attacks with that monster, he announces "Gash the Dust Lord attacks!"
When Jack activates that monster's effect, he announces "Gash the Dust Lord's effect!"
When Jack Summons "Magical King Moonstar", he announces "Come! Magical King Moonstar!"
Most of the time when Jack attacks with that monster, he announces "Magical King Moonstar! Attack!", followed by "Star Flash!"
When Jack activates that monster's effect, he announces "Magical King Moonstar's effect!"
When Jack Summons "Medium Piece Golem", he announces "Come, Medium Piece Golem!"
Most of the time when Jack attacks with that monster, he announces "Attack, Medium Piece Golem!"
When Jack activates that monster's effect, he announces "Medium Piece Golem Special Summons a monster from my deck!"
When Jack Summons "Mirror Resonator", he announces "The Tuner Monster, Mirror Resonator!"
Most of the time when Jack attacks with that monster, he announces "Mirror Resonator attacks!"
When Jack activates either of that monster's effects, he announces "Mirror Resonator's effect activates!"
When Jack Summons "Multiple Piece Golem", he announces "Combine and form Multiple Piece Golem!"
Most of the time when Jack attacks with that monster, he announces "Multiple Piece Golem! Destroy!"
When Jack activates that monster's effect, he announces "Multiple Piece Golem's effect activates!"
When Jack Summons "Phantom King Hydride", he announces "The Tuner Monster, Phantom King Hydride!"
Most of the time when Jack attacks with that monster, he announces "Attack, Phantom King Hydride!"
When Jack Summons "Red Gardna", he announces "Here comes Red Gardna!"
Most of the time when Jack attacks with that monster, he announces "Red Gardna attacks!"
When Jack activates that monster's effect, he announces "I send Red Gardna from my hand to the Graveyard!", followed by "Now your effects can't destroy my monsters this turn!"
When Jack Summons "Red Mirror", he announces "Come out! Red Mirror!"
Most of the time when Jack attacks with that monster, he announces "Red Mirror attacks!"
When Jack activates either of that monster's effects, he announces "Red Mirror's effect activates!"
When Jack Summons "Red Resonator", he announces "The Tuner Monster, Red Resonator!"
Most of the time when Jack attacks with that monster, he announces "Red Resonator attacks!"
When Jack activates either of that monster's effects, he announces "Red Resonator's effect activates!"
When Jack Summons "Red Sprinter", he announces "Here's Red Sprinter!"
Most of the time when Jack attacks with that monster, he announces "My Red Sprinter attacks!"
When Jack activates that monster's effect, he announces "Red Sprinter's effect activates!", followed by "I Special Summon a Level 3 or lower Fiend-Type Tuner!"
When Jack Summons "Red Warg", he announces "Come out, Red Warg!"
Most of the time when Jack attacks with that monster, he announces "Attack, Red Warg!"
When Jack activates that monster's effect, he announces "Red Warg's effect activates!", followed by "I Special Summon it from my hand!"
Before Jack Synchro Summons "Red Rising Dragon", he announces "My crimson dragon shines upon the infernal path!", followed by "Synchro Summon!" When Jack Summons "Red Rising Dragon" (by any method), he announces "Fly, Red Rising Dragon!"
Most of the time when Jack attacks with that monster, he announces "Red Rising Dragon attacks!"
When Jack activates either of that monster's effects, he announces "Red Rising Dragon! Activate your effect!"
When Jack Summons "Sinister Sprocket", he announces "The Tuner Monster, Sinister Sprocket!"
Most of the time when Jack attacks with that monster, he announces "Attack, Sinister Sprocket!"
When Jack activates that monster's effect, he announces "Sinister Sprocket's effect!"
When Jack Summons "Small Piece Golem", he announces "Come, Small Piece Golem!"
Most of the time when Jack attacks with that monster, he announces "Small Piece Golem attacks!"
When Jack activates that monster's effect, he announces "Here's Small Piece Golem's effect!"
When Jack Summons "Synkron Resonator", he announces "The Tuner Monster, Synkron Resonator!"
Most of the time when Jack attacks with that monster, he announces "Synkron Resonator attacks!"
When Jack activates that monster's effect, he announces "Synkron Resonator's effect activates!"
When Jack Summons "Vice Dragon", he announces "Soar! Vice Dragon!"
Most of the time when Jack attacks with that monster, he announces "Turn 'em to ash, Vice Dragon!"