Calm surroundings turn Hulk into Bruce Banner who believes Betty is in danger, and reaching the nearest city, hires a pilot, Spad McKraken to take him to the Niagara Falls.
But as they arrive, Bruce loses his cool and turns into the Hulk who jumps out of the plane, diving into the falls.
When Talbot finds out the Hulk is there, he calls Thunderbolt Ross who asks Talbot to take Betty away, and sends in the Armed Forces.
Meanwhile, Hulk is attacked by the Tiger Shark, an amphibious super villain who hid in the falls in fear of the Sub-Mariner whose father he had killed.
After struggling a bit, Hulk knocks his enemy down, right when fighter planes arrive to attack him. In dire need to find Betty, Hulk avoids the new fight and escapes by making a tunnel in the rock, coming out several miles away, to pursue his search for Betty!