Galactica Crunch is an energy strike used by Sailor Iron Mouse, one of the animate villains powered by Galactica Bracelets. It runs through the manga, the Crystal adaptation, and the stage musicals.
The attack is energy based and belongs to Sailor Iron Mouse. It first appears in the manga chapter Act 50 and later features in Sailor Moon Cosmos as well as the Sera Myu. Its Japanese name is Gyarakutika Kuranchi, and it draws on the power of her Galactica Bracelets.
Iron Mouse looses the energy through her bracelets against her targets. In the manga clash the guardians repel it outright, meeting the blast with Space Turbulence and Submarine Violin Tide.

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Galactica Crunch is an energy-based attack used by Sailor Iron Mouse, one of the villains empowered by Sailor Galaxia's Galactica Bracelets.
Sailor Iron Mouse is the sole wielder of Galactica Crunch, channeling the energy through her Galactica Bracelets.
In the manga, the Sailor Guardians repel Galactica Crunch by meeting it head on with Space Turbulence and Submarine Violin Tide.
Galactica Crunch first appears in the manga's Act 50 and later features in Sailor Moon Cosmos and the Sera Myu stage musicals.
During the musical Legend of the Shooting Stars, Sailor Iron Mouse aims Galactica Crunch at Sailor Mercury, but the character Saitou Izou steps into its path and is struck down instead.
Looking for more on Galactica Crunch? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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