Previously Clark and professor Thorp had arrived at the ship, the Juanita where suspicious things are developing. After hearing a distress signal, Clark rushes to learn who is behind it. Slipping away from the professor, Clark switches to Superman to tear open a steel door and find a man tied up, and claiming to be Captain Maddox.
The three men, Clark, the professor, and the real captain rush to the upper decks, but the fake captain may have other plans. A struggle ensues. Once Clark overcomes the fake captain and radio man, a strange tatoo offers a clue, but the details are slow in coming.
The professor claims to have a secret, and a strange radio message leaves questions to be answered in the next exciting installment.