Bates, Swan and Roussos make Superman turn chicken in Action 390 (July 1970).
Superman gets chased by a mechanical bomb, which defies all his attempts to evade or destroy it. He even flies through time, bringing the machine along with him to the explosion of Krakatoa, but it has no effect.
Superman determines that the bomb is of Kryptonian origin. Contacting the Kandorians, he discovers that it was built by Jor-El, and is attuned to his brainwaves, and capable of following him anywhere. Eventually, Superman figures out that it is not so much a bomb, as a device designed to scare him to death.
It was designed as a weapon against alien invasion, and powered by the fear of those it pursues. Superman had encountered it as a baby in his father’s lab, and it scared him then. His adult reaction is a result of those memories. All Superman has to do to deactivate the device is to stop being scared, which he does.
The Dark Circle are behind the events in this story by Bridwell, Mortimer and Abel, although they do not appear in person. They are behind the troubles brewing on Lahum, where rebels seek to overthrow a militaristic dictator. The mission is handled by the Legion Espionage Squad, which is under the command of Chameleon Boy. He selects Saturn Girl, Brainiac 5, Element Lad, Karate Kid and Timber Wolf as his team. Proty II briefly appears, his final appearance until the 80s.
The Legionnaires infiltrate both sides of the dispute. With the rebels, they pretend to have powerful weapons that can stop the government’s android army in their tracks. In reality, the weapons do nothing, it’s Element Lad’s powers that do all the work.
Saturn Girl heads to the capital, to get a job at the presidential palace. But one of the workers there recognizes her…
The story concludes in the next issue.