The voices are decent and synced well. The idea of a man who can't feel pain is a good one. Watching him get pummeled in the face only to laugh and crack the alien was great. The DJ turning on the music was a nice segway into the action. I also love how many different species you've drawn up for this animation.
The action itself wasn't to great. It was a bit slow and stiff at times. Once the feline alien comes into play he really speeds the action up until he jumps up. He jumps up very slowly. I do love when he gets grabbed up how quickly and how much he gets slammed though. Jumping onto the giant at the end felt like a rushed idea on how to end the fight scene quickly, but it was still a decent part of the film.
Overall I thought this was a decent little film. Perhaps if expanded on in the future it may be a great new series here on Newgrounds! 4/5.