The door to another reality has opened up for Tom and Cat. This new world has no petroleum-based products due to the introduction of a genetically engineered microbe that consumed all petroleum-based products leaving an Earth to survive without natural gas, gasoline and plastics.
Tom and cat make friends and loose them as quickly. In the mean time Thane is hot in their trail.
This issue does not move the story very much. We learn of an alternate Earth, but not the one that Cat comes from. I suspect that the next issue will conclude this introductory story-arc leaving behind more questions than it answers.