This story starts here.

↓ Transcript
Panel 1:
Chloe walks by PooPal.
PooPal: I've been studying interdimensional engineering, and I believe I've made a major break through.
I made some modifications to my interior to test my theories.
Panel 2:
PooPal: Could you step inside the litter chamber and tell me if it worked?
Chloe gets in. Chloe: Sure!
Panel 3:
Close up on Chloe.
Chloe (eyes wide): *gasp*
Panel 4:
Chloe stands in a large chamber.
Chloe: Either I've been watching too much Dr. Who, or you're trying to tell us that we poop too much.