Yu-Gi-Oh! - Episode 050

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"The Mystery Duelist, Part 1"
EnglishThe Mystery Duelist, Part 1
Japanese name
Japanese過去からの挑戦 戦慄のゼラ
RōmajiKako kara no Chōsen Senritsu no Zera
TranslatedChallenge from the Past - The Terrifying Zera
Japanese OP"S H U F F L E"
Japanese ED"The Afternoon of that Day"
English OP & ED"Yu-Gi-Oh! Season 2 Theme"
Air dates
JapaneseApril 10, 2001
EnglishNovember 16, 2002
Yu-Gi-Oh! episodes (season 2)
Previous"Dungeon Dice Monsters, Part 4"
Next"The Mystery Duelist, Part 2"

"The Mystery Duelist, Part 1", known as "Challenge from the Past - The Terrifying Zera" in the Japanese version, is the fiftieth episode of the Yu-Gi-Oh! anime. It is the season 2 premiere, as well as the first episode in the Battle City arc. It first aired in Japan on April 10, 2001, and in the United States on November 16, 2002.

An arcane fortune teller steals the Millennium Puzzle and Yugi must defeat him in a Duel to win it back.


Yugi Muto now has exchanged the brown rope for a chain in order to keep his Millennium Puzzle as safe as possible. Yami Yugi explains that this change is vital since the Millennium Puzzle connects the two, and he also senses that fate has more in store.

Then Yugi and Téa Gardner are heading to the soccer game at school when they come across a fortune teller who Yugi believes can help him see what is in the future for him. The fortune teller asks for a personal item and suggest the Millennium Puzzle which, once in hand, he steals it.

Téa runs into Yami Bakura, who wants the Millennium Puzzle, and uses his Millennium Ring to find the Millennium Puzzle. The fortune teller then alarms Yugi by saying that the only way to get the puzzle is to win it in a Duel. But the catch is, since the Millennium Puzzle isn’t close or on Yugi, then he would have to do this Duel without Yami Yugi's help.

During the Duel, Yugi realizes that only one person has a lot of machine cards, and that is Bandit Keith. His guess is right, but it is not truly Keith since he is now the host of someone else — Marik Ishtar.

Meanwhile, Téa, Joey Wheeler, and Tristan Taylor search for Yugi.

Major events[edit]

  • Keith is under the control of Marik Ishtar, who cheats during this Duel.
  • Whoever wins this Duel gets to keep the Millennium Puzzle, which Keith stole earlier disguised as a fortune teller.
  • Yugi is forced to Duel without Yami Yugi. In the dub, this is because the Puzzle is not within Yugi's reach, weakening his bond with Yami Yugi. In the original, Marik staged the Duel so Yami Yugi would take over to protect Yugi, giving Marik a victory over the pharaoh as well as possession of the Puzzle. However, Yami Yugi senses the trap and holds back.

Featured Duel: Yugi Muto vs. "Bandit" Keith Howard[edit]

Turn 1: Yugi
Yugi Normal Summons "Celtic Guardian" (1400/1200) in Attack Position.

Turn 2: Keith
Keith Sets a monster.

Turn 3: Yugi
"Celtic Guardian" attacks and destroys Keith's Set monster, "Cyber Jar" (900/900). The Flip effect of "Cyber Jar" activates, destroying every monster on the field. After that happens, the Flip Effect of "Cyber Jar" lets both Yugi and Keith excavate the top five cards from their respective decks and Special Summon any Level 4 or lower monsters them drew in Attack Position or face-down Defense Position before adding the remaining cards to their respective hand. Yugi Sets a monster while Keith Special Summons "Mechanicalchaser" (1850/800) and "Ground Attacker Bugroth" (1500/1000) in Attack Position. During the End Phase, he discards four cards as his hand surpasses the hand size limit.

Turn 4: Keith
Keith Normal Summons "Machine King" (2200/2000) in Attack Position. Due to the effect of "Machine King", it gains 100 ATK for each Machine-Type monster on the field. There are currently three ("Machine King": 2200 → 2500/2000). "Machine King" attacks and destroys Yugi's face-down "Silver Fang" (1200/800). During the End Phase, Keith discards two cards as his hand surpasses the hand size limit.

Turn 5: Yugi
Yugi Sets a monster.

Turn 6: Keith
Keith draws "Megasonic Eye" and subsequently Normal Summons it (1500/1800) in Attack Position ("Machine King": 2500 → 2600/2000). "Machine King" attacks and destroys Yugi's face-down "Giant Soldier of Stone" (1300/2000).

Turn 7: Yugi
Yugi draws "Curse of Dragon" and Normal Summons it (2000/1500) in Attack Position. Yugi then Normal Summons "Gaia The Fierce Knight" (2300/2100) in Attack Position. He then activates "Polymerization" to fuse "Curse of Dragon" with "Gaia The Fierce Knight" and Fusion Summon "Gaia the Dragon Champion" (2600/2100) in Attack Position. "Gaia the Dragon Champion" attacks and destroys "Mechanicalchaser" (Keith 2000 → 1250) ("Machine King": 2600 → 2500/2000).

Turn 8: Keith
Keith switches "Megasonic Eye" and "Ground Attacker Bugroth" to Defense Position. Keith then activates "Machine Conversion Factory" to increase the ATK and DEF of every Machine-Type monster he controls by 300 ("Machine King": 2500 → 2800/2000 → 2300; "Ground Attacker Bugroth": 1500 → 1800/1000 → 1300; "Megasonic Eye": 1500 → 1800/1800 → 2100). "Machine King" attacks and destroys "Gaia the Dragon Champion" (Yugi 2000 → 1800).

Turn 9: Yugi
Yugi draws "Summoned Skull". He then activates "Makiu, the Magical Mist" to decrease the ATK and DEF every Machine-Type monster by 300 ("Machine King": 2800 → 2500/2300 → 2000; "Ground Attacker Bugroth": 1800 → 1500/1300 → 1000; "Megasonic Eye": 1800 → 1500/2100 → 1800). He then Normal Summons "Summoned Skull" (2500/1200) in Attack Position. "Summoned Skull" gains 750 ATK due to the effect of "Makiu, the Magical Mist" ("Summoned Skull": 2500 → 3250/1200). "Summoned Skull" attacks and destroys "Machine King" (Keith 1250 → 500). During the End Phase, the effect of "Makiu" expires ("Summoned Skull": 3250 → 2500/1200).

Turn 10: Keith
Keith draws "Graceful Charity" and activates it to draw three cards and discard two cards (he illegally placed three cards on top of his Deck right before drawing through the effect of "Graceful Charity"). Keith activates "Zera Ritual" to Tribute "Ground Attacker Bugroth" and "Megasonic Eye" to Ritual Summon "Zera the Mant" (2800/2300) in Attack Position. "Zera the Mant" attack]]s and destroys "Summoned Skull" (Yugi 1800 → 1500).

Duel continues next episode.

Featured cards[edit]

The following cards appeared in this episode. Cards in italics debuted here.


This is the first episode where Rica Matsumoto plays Ryo Bakura. Bakura was previously played by Yo Inoue, who stepped down to due health concerns, having voiced him in episodes 12 to 41.

Japanese character name Japanese voice actor
Yugi Mutou Shunsuke Kazama
Anzu Mazaki Maki Saito
Katsuya Jonouchi Hiroki Takahashi
Hiroto Honda Takayuki Kondo
Ryo Bakura Rica Matsumoto
Sugoroku Mutou Tadashi Miyazawa
Marik Ishtar Tetsuya Iwanaga
Bandit Keith Hajime Komada
Yugi's mother Masami Suzuki
Mr. Morita Eiji Takemoto

Differences in adaptations[edit]

"Summoned Skull" being destroyed by "Zera the Mant" in the original version and the dub.
  • In the dub, scenes of Yugi's mother are cut from the beginning of the episode.
  • In the dub, all the text throughout Domino City is erased.
  • The words "TO BE CONTINUED" are added at the end of the dub episode.
  • In the dub, the gun is removed from the flashback.
  • When re-aired in the 2010s, this season was titled Rulers of the Duel.
  • In the dub, Marik tries to force Yugi to hand over the Millennium Puzzle; in the original Japanese version, Marik tries to force Yugi to reveal Yami Yugi's presence.


  • After "Cyber Jar" is played face-down, it is seen face-up from behind Keith.


  • Yugi switches out the rope necklace on the puzzle for a stronger chain, fearing for its safety.
  • Bandit Keith did not appear in the original manga after Duelist Kingdom. This episode was used to help with plot holes that the Dungeon Dice Monsters episodes left, as it did not follow the manga exactly.