In the original series numbering, of Yu-Gi-Oh! Zexal is titled "Party Panic" (Japanese title: "The Grand Feast of Justice! Calling on ESPer Robin!!").
However, "Zexal Second" (or Zexal II ) typically refers to the second half of the series, starting from Episode 74. If you are looking for the 50th episode specifically within the Zexal II sequel (which would be Episode 123 of the overall series), that episode is titled (Japanese title: "Hero's Arrival! The One Standing Against the Three Emperors!"). Yu-Gi-Oh! ZEXAL — Episode 50: "Party Panic" Yu-Gi-Oh! Zexal Second Episode 50
A massive invitation-only party is held for the 23 finalists of the WDC. Yuma Tsukumo is excited to attend, but his friends—who aren't finalists—initially feel left out until Flip finds a way to sneak everyone in. In the original series numbering, of Yu-Gi-Oh
While Yuma is down, his allies step up. Specifically, Kaito (Kite) Tenjo arrives to face the Barian Emperors, standing as the "single blue shadow" protecting his friends. However, "Zexal Second" (or Zexal II ) typically
Confidence and the calm before the storm as the world's greatest duelists gather in one place.
Yuma, Astral, Tori, Shark, Kite, and the introduction/reappearance of various WDC finalists.