Yu - Gi - Oh ! - Episode 051 " The Mystery Duelist , Part 2 " , known as " The Shattered Millennium Puzzle " in the Japanese version , is the fifty - first episode of the " Yu - Gi - Oh ! " anime . It first aired in Japan on April 17 , 2001 , and in the United States on November 16 , 2002 . Summary . Yami Bakura arrives and severs the connection that bonded Keith and Marik Ishtar together , freeing Keith from the Ishtar hold . He then alters a piece he picked up so that he can ensure his control over the Millennium Puzzle . Yami Bakura thinks up the plan for his take over of all Millennium Items . Ishtar / Keith shatters the puzzle . Yami Bakura leaves , and Bandit Keith starts a fire and leaves , too . Yugi struggles to put the puzzle back together fast . He rathers the spirit survive than himself . Joey , Tristan , and Téa arrive outside the now inflamed building . Joey and Tristan break into the burning building . Yugi who got dizzy from the heat and smoke refuses to leave without the puzzle , his hands attached to it . They then struggle to get Yugi to leave and then figure that the only way to save Yugi is to get the puzzle . They finally figure out a way and free the puzzle from the wall and the trio then arrive safely outside with the now weak , unconscious Yugi , in Tristan ' s arms . Yugi is then at the hospital and thanks everyone for their help . He know he has a journey to undertake . But who wants the puzzle now ? What ' s next ? Featured Duel : Yugi Muto vs . " Bandit " Keith Howard . " Duel continues from the previous episode . " Yugi has 1500 LP remaining and control s no cards . Keith has 500 LP remaining and controls " Zera the Mant " ( 2800 / 2300 ) in Attack Position and no Set cards . Turn 11 : Yugi Yugi draws " Koumori Dragon " and subsequently sets it . Turn 12 : Keith Keith draws " Seiyaryu " and subsequently Normal Summons it ( 2500 / 2300 ) in Attack Position . Keith ' s hand contains " Solemn Judgment " , " Ground Attacker Bugroth " , " Curse of Fiend " , and " Stop Defense " . Keith secretly uses the mechanical claw in his hand to swap " Ground Attacker Bugroth " with " Magic Jammer " . He then Set s " Magic Jammer " and activates " Stop Defense " to switch Yugi ' s Set monster , " Koumori Dragon " ( 1700 / 1200 ) to Attack Position . " Zera the Mant " attack s and destroy s " Koumori Dragon " ( Yugi 1500 → 400 ) . Turn 13 : Yugi Yugi draws . He then Set s a monster . Turn 14 : Keith Keith draws . " Seiyaryu " attack s and destroy s Yugi ' s Set monster , " Mystical Elf " ( 800 / 2000 ) . Keith then Set s two cards and switches " Zera the Mant " to Defense Position . Turn 15 : Yugi Yugi draws " Mirror Force " . He then sets one card and Normal Summon s " Dark Magician " ( 2500 / 2100 ) in Defense Position . Yugi then activate s " Magical Hats " to create four hats and hide his " Dark Magician " in one of them . Turn 16 : Keith Keith draws . Keith then activates his face - down " Magic Jammer " to negate the effect of " Magical Hats " and destroy it by discard ing one card from his hand . This removes the hats created by the effect of " Magical Hats " . On Keith ' s Standby Phase , he activate s his face - down " Curse of Fiend " to switch the Battle Position of every monster on the field ; " Seiyaryu " is switched to Defense Position while " Zera the Mant " and " Dark Magician " are switched to Attack Position . " Zera the Mant " attack s " Dark Magician " , but Yugi activate s his face - down " Mirror Force " to destroy all Attack Position monsters Keith controls , however Keith activates his face - down " Solemn Judgment " to negate the effect of " Mirror Force " and destroy it by paying half of his Life Points ( Keith 500 → 250 ) . " Zera the Mant " destroys " Dark Magician " ( Yugi 400 → 100 ) . Turn 17 : Yugi Yugi draws a card and subsequently sets it . He then sets a monster . Turn 18 : Keith Keith draws . He then secretly swaps a card in his hand with " Tribute to the Doomed " . Keith then activate s " Tribute to The Doomed " to discard a card from his hand and destroy Yugi ' s Set monster , but Yugi activates his face - down " Living Arrow " to change the target of " Tribute to the Doomed " to " Zera the Mant " , destroying the latter instead . The Duel , at this point , ends due to Yami Bakura ' s interference . Epilogue After Keith breaks free of Marik Ishtar ' s control due to Yami Bakura setting his mind free , he shatters the Millennium Puzzle . Yugi quickly regathers the pieces . Yami Bakura secretly puts a piece of his spirit into one of the Millennium Puzzle pieces before he leaves . When Marik tries to take back control of Keith , he swings a metal bar around in an attempt to stop Marik . This action unintentionally hits a control box to the Duel platform , setting the warehouse on fire . Keith flees the warehouse as Marik tries to regain control of him . Yugi finishes fixing the puzzle just before he collapses . Joey and Tristan quickly rescue Yugi and his puzzle before the fire envelops the entire warehouse . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .