First, choose any characters you like and start the mission - ...Best Served Chili.
It is similar to Red Power, but you need to turn on the power first before the boss hit the electronic boxes, after a while, the power will go out and you need to turn on the power again.
After both arms were broken (left 3 times & right 3 times), you need to go to the center part below the boss and hit the boss 3 times. Each time after you hit the boss, it will fly up. It will land only when you clear all the robot below.
After the body was broken, you need to find the explosive boxes around and throw it to the boss head 3 times.
Tips: I found it using Kenny's superhero power is more easier for the boss head section. When you take an explosive box, both of you and the box will be unbeatable. It can prevent you from dying and moving more freely! And after the superhero time is gone, your life will be fully recovered!
Here's a link from HAcoreRD