Chikyuu Sentai Fiveman

The Hoshikawa family once lived on the planet Sidon, where Dr. Hoshikawa and his wife worked to transform the barren world into a green planet. Their lives were shattered when the Silver Imperial Army Zone attacked, separating the parents from their five young children.

The children escaped and were raised by the support robot Arthur G6. Years later, Gaku, Ken, Fumiya, Kazumi, and Remi return to Earth as teachers, using the lessons of family, science, and courage to guide their students while secretly preparing to fight the Zone.

When the Zone targets Earth as its thousandth conquered planet, the five siblings become the Fivemen. Their battle is both a defense of Earth and a continuation of the tragedy that began on Sidon.

After defeating the Zone, the Hoshikawa siblings leave Earth to search the stars for their missing parents, carrying their family's mission beyond the classroom and into space.