At the start of Zombotron 2, the new main character crash lands in the space-pod. If you reset, the door is gone. You can shoot the door.
The space-pod suddenly crashes into the planet right on top of the old hero from the first game. It causes an explosion and the old hero is killed. Then, the new hero emerges from the upside-down and smoking space-pod.
The space-pod has a door with two yellow arrows on it. It also has thrusters to manuver it through space.