A story involving aliens, zombies, robots and superheroes. How would it come together?

So one day there was an alien. He went down to Earth. A robot was walking his dog at the time and happened to run into the alien. The robot said "are you a human?" THe alien said "No". The robot said "I am protector of humans and only humans", then proceeded to murder the alien. The robot buried the alien the next day. That night the alien's grave started to move and a zombie appeared up from the alien's tombstone. The alien had turned into a zombie. Then one day the zombie was eating some McDonald's since Big Mac's are actually cow brains. Some time later Super Doge, disguised as a dog, saw the Big Mac and broke free from the robot's leash. Super Doge charged at the Big Mac and happened to bite the zombie's finger. He decided the zombie tasted better and spit the Big Mac out. The zombie was then murdered for a second time. The end.