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Mass Hip-Po-Sis (Japanese: 迷子のヒポポタスを助けろ！ Save the Stray Child Hipopotas!) is the 44th episode of Diamond & Pearl. It first aired in Japan on August 23, 2007 and in the United States on January 5, 2008.

Spoiler warning: this article may contain major plot or ending details.

Synopsis

Major events

Debuts

• Hippopotas

Characters

Humans

• Ash Ketchum
• Brock
• Dawn
• Jessie
• James
• Sinnoh Now Staff
  • Rhonda
  • Jack
• Giovanni (fantasy)

Pokémon

• Pikachu (Ash's)
• Meowth (Team Rocket)
• Turtwig (Ash's)
• Aipom (Ash's)
• Staravia (Ash's)
• Piplup (Dawn's)
• Buneary (Dawn's)
• Pachirisu (Dawn's)
• Buizel (Dawn's)
• Sudowoodo (Brock's)
• Croagunk (Brock's)
• Happiny (Brock's)
• Cacnea (James's)
• Hippopotas

Trivia

• Music from Lucario and the Mystery of Mew, Pokémon Ranger and the Temple of the Sea, and Because the Sky is There are used as background music.
• Hippopotas is seen riding atop Ash's head (at Ash's insistence), despite weighing over one hundred pounds.
• Jessie frequently mispronounced Hippopotas's name. (In the dub, it's a different way each time.)
• It is also one of the few episodes since Tricks Of The Trade in which Jessie's Wobbuffet didn't appear.
• Professor Oak's lecture returns.
• Professor Oak's lecture: Mothim
  • Pokémon senryū: ガーメイル　おてがみかいたよ　eメイル Gāmeiru, otegami kaita yo, imeiru "Garmeil, it wrote a letter, an email"
• Ash narrates the next episode preview.

• The road construction sign that was written in kanji was left unedited in the dub.
• The same Hippopotas from this episode appears in Sleight of Sand!.

Errors

• When Rhonda met up with Ash, Dawn and Brock, she was holding the microphone in her right hand and waved them with her left hand. The next screenshot, it was reversed, but after that it switched again.

Dub edits

In other languages

• Italian: Un Hippopotas in pericolo
• Iberian Spanish: ¡El Hippopotas perdido!
• Latin American Spanish: ¡Hip-Po-Sis masiva!
• Dutch: De Verdwaalde Hippopotas!

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This episode article is part of Project Anime, a Bulbapedia project that covers all aspects of the Pokémon anime.