Invader Zim (2015) #39 (Cover B)

When an alien ship crashes on Earth, its builders demand to know who is responsible for causing the accident. They have four suspects to interrogate: siblings Dib and Gaz Membrane, a green earth-child just named ZIM, and a green earth-dog named GIR. Only one is telling the truth. But which one? And why? And which one? And why?