Season 1

E1 · 24 min

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.

E2 · 24 min

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.

E3 · 24 min

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.

E4 · 24 min

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.

E5 · 24 min

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?

E6 · 24 min

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.

E7 · 24 min

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.

E8 · 24 min

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.

E9 · 24 min

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.

E10 · 24 min

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?

E11 · 24 min

WE ARE “THUNDER ３”!!

The "Small Three" arrive as live-streamed reinforcements to battle alien invaders, save Futaba, and officially debut as "THUNDER 3".

E12 · 24 min

FINAL ATTACK

The cry rings out around the world for the Thunder 3! Humanity's last hope and their saviors against the aliens!