Invincible Vol 04: Head Of The Class TPB writer-Maria Medem When a new threat threatens

When a new threat threatens the Earth

the savage Super-Skrull

Sheriff Mal Reynolds has a new partner-a law enforcing robot from the Blue Sun corporation

Batman comes to the conclusion that their prime suspect in each case were deceased

He says he was being used by the terrifying Ra Moon

Invincible Vol 04: Head Of The Class TPB writer-Maria Medem When a new threat threatensAfter the cataclysmic events of Volume 3, Mark Grayson (a. k. a. Invincible) is left to pick up the pieces and try to continue on with some sort of life. His mother is a wreck, and his friends don't understand and the super villains of the world just want to beat him up. Mark has a lot on his shoulders and graduation is just around the corner.