Spectrinauts

Four high school students accidentally create a portal. This leads to the discovery of The Children of Cain, who live on a similar but dying earth-like planet. Their astronauts, named Zeitnauts, have sworn to return to take earth as their own.

Friendship Martial Arts Military Robots Science Space Kids (3-12)
Teenagers (13-18)
Adults (18+)
Adam and Eve Cain earth high school Science fiction students threat to earth