Invincible, Vol. 9: Out of this World

Allen the Alien returns to Earth as directed by the Coalition of Planets – he's come to gather information from Mark about his father – the Viltrumite Traitor. Meanwhile, the Viltrumites have come to Earth to check up on Mark's progress as the reluctant Viltrumite Agent of Earth. Alse: There are fights. Collects INVINCIBLE #42-47