Once again 4 members of the Science Ninja Team unite to fight a new foe, but this time it appears that Ken's world may be the source of the problem. He as to decide if one of his oldest allies has become the enemy.
Except for Condor Joe (who is from an alternate world) there are NO other members of the Science Ninja Team in this movie. There are, however, three (other worldly) Japanese superheroes who assist Ken the Eagle against the "Nexus" and a corrupt Dr. Nambu (who is from the same alternative world as Joe). Both of these threats endanger the very fabric of their home worlds' realities.