Resumen:
During a huge battle, all of the "primitive" Transformers are summoned
to a planet. An energy creature has been unleashed, and it drains the life
energy of all the other Transformers. Its creator, Primacron, was also
responsible for Unicron and many of the primitives, and his assistant believes
that only the instincts of those Transformers can stop the intellect of
Primacron. All except Grimlock are defeated and he stops the energy being who
has betrayed Primacron by throwing the system into reverse.