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Overview
Unremarkably ordinary middle schoolers, Pyontaro, Hiroshi and Tsubame, wander into an extraordinary adventure when Pyontaro's little sister goes missing.
Cast
Sayumi SuzushiroPyontaro (voice)
Natsumi KawaidaTsubame (voice)
Eri AkiyamaHiroshi (voice)
Honoka MitsubachiFutaba Tezuka (voice)
Shogo SakataDoc (voice)
Taito Ban 
Yuuki Hirose 
Ryoko Maekawa 
Haruki Ishiya Seasons and episodes
1 season12 episodes
Season 1
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E1 SMALL THREE
Pyontaro, Hiroshi and Tsubame — the Small 3 — load up an odd disc from their teacher. When they're not looking, Pyontaro's little sister Futaba vanishes.
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E2 MULTIVERSE
Stranded in a new world, the Small 3 realize they have incredible powers. They meet other versions of themselves and learn how this reality differs.
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E3 ALIENS
Futaba's abductors subject her to tests, but she just wants her big bwudder. The Small 3 continue the search for Futaba and encounter a tense standoff.
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E4 MR. SEGAMI
As college student Segami struggles with his dystopian world, a hot schoolmate hands him an enticing flyer. Hoping to meet girls, he finds something else.
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E5 REBELLION
With his mind in a whirl, Segami runs into the Small 3. They witness a bold fighter pilot pit his life against an alien ship. Will it light a fire?
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E6 GAME ON
The Rebellion announces a guerrilla attack in Shibuya and Segami resolves to join. Meanwhile, a distraught Futaba stumbles upon a furry winged creature.
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E7 COUNTERATTACK
Aliens surround a sleeping Futaba! In Shibuya, Segami and his comrades fight fiercely but lose ground. As he retreats, he spots Tashiro under attack.
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E8 THE STRANGERS
Futaba faces off against a squad of alien soldiers to protect her new friend. Facing heavy losses, Segami and the Rebellion turn to their secret weapon.
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E9 THE STRONG MEN
Genius commandeers an alien walker and leads a counterattack. But two fearsome alien soldiers are en route. Meanwhile, Doc and the others seek answers.
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E10 TIME IS UP
As the Small 3 soar toward Shibuya, Genius runs out of options against a relentless alien warrior. Reinforcements arrive — but will it be enough?
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E11 WE ARE “THUNDER ３”!!
The "Small Three" arrive as live-streamed reinforcements to battle alien invaders, save Futaba, and officially debut as "THUNDER 3".
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E12 FINAL ATTACK
The cry rings out around the world for the Thunder 3! Humanity's last hope and their saviors against the aliens!
If you like Thunder 3
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