Interestingly Danny didn't notice that the Infinite Realms were filled not only with humans, but also with aliens. Thousands of lost civilizations also manifested themselves before his eyes at any moment, which of course excited him.
The first civilization he met, the Martians, were very suspicious despite being technically all ghosts (maybe they don't understood) the halfa worried every time he saw them since they always seemed to be waiting for an attack. Although one girl in particular befriended him.
That's the reason Danny let them visit Mars again (in their original dimension) not for long of course, and with many precautions, but he wanted them to remember their home and feel a little better (maybe introduce the Realms after that and explain they are...well, dead). Maybe it was a bad idea, all things considered, but the boy didn't care. Most of the Martians didn't agree to go anyway.
What he didn't expect was that his little field trip would run into the last living Martian. The halfa chuckled looking at the confused Martian before fading out of sight.
