Criminals have the Blackhawks trapped, so it's time to call in the secret eighth Blackhawk, Rob. Rob is the Robot Blackhawk and he easily frees the Blackhawks. But when Rob pursues the gang leader, he runs through some high voltage lines that knock him out, allowing the gang leader to reprogram him and take control of him.
While in pursuit of Captain Magnet, Stanislaus' plane is brought down by an onslaught of magnetic rockets. After being rushed to the hospital, the doctor reports to Blackhawk that Stan has suffered a fatal brain injury and has six months to live. The Hawks try to keep it secret, but when Stan finds out he decides to fly a one-man mission against Captain Magnet.
Killer Shark returns with the ability to control the creatures of the ocean. He plans the destruction of a luxury cruise ship if a ransom isn't paid, so the Blackhawks decide to take the cruise to protect the ship.