Beelzeborg

This Transformer-like robot, who is described for the attract mode as "Scumlabs' urban pacification dreadnaught", appears on some days to attack the mutants; he walks into view from the right side of the screen (like the Star Wars-like robotic walkers do), and can temporarily stun the mutants by punching them to knock them over. Once he has been hit enough times, he shall explode, then become one of those aforementioned Star Wars-like robotic walkers - however, you will still have to hit him enough times in this form, to completely defeat him.