The water of the Sulphurous Sea bubbles and the Nuclear Terror leaps out in a burst of radioactive mist, killing all surrounding lifeforms except the player and itself. It alternates between the following attacks:
Radioactive Slam
- The Nuclear Terror jumps above the player and slams down, releasing an X-shaped burst of Radioactive Steam.
- It repeats this attack 3 times before moving on to the next one.
Gamma Rain
- The Nuclear Terror leaps high into the air, bringing down a shower of Gamma Bursts for 1.5 seconds.