Takumi Saitoh

as Jun

Asumi Nakada

as Mayumi

Masaki Tachi

as Dr. Garigolin

Yusuke Numata

as Jun / Wonder Seven (voice)

Tomoko Kawakami

as Mayumi (voice)

Shigeru Chiba

as Dr. Garigolin / Narrator (voice)

Wasabi Mizuta

as Kechompa (voice)

Ryuuzaburou Ootomo

as Kirugoa (voice)

Seizo Kato

as Wonder Stick (voice)

Tomohiro Nishimura

as Wonder Blaster (voice)