The best replacement for ninja storm is wild force.

The best alternatives to ninja storm are rated as following:
★★★★★  wild force
★★★★★  dino thunder
★★★  spd
★★  hurricanger
★★  jungle fury
★★  power rangers wild force
★  operation overdrive
★  mystic force
★  broken bond
★  naruto the broken bond
★  thunder storm
  power rangers dino thunder
  dino thunder youtube
  dinothunder

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Speaking about ninja storm, one probably shouldn't forget about dino thunder.

Other search terms related to ninja storm and their ratings are:
★★★★★ dino thunder
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ninja storm
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