From their nerve center penthouse lair, the Robot supports the extraterrestrial superhero of the shining city of Pallas, the Alien. When a train disaster reveals an arms-smuggling operation, the Alien decides it is time for the Robot to join him in the field.

On the other end of the pipeline, in the city of Crowsport, resident vigilante crimefighters, the Protector and his sidekick, the Understudy, are closing in on a local gang boss.

Following the leads of their separate investigations, the Alien and the Protector—with the Robot and the Understudy in tow—serendipitously meet, but their joint operation is broken when the Alien is inexplicably murdered.

Now, the Robot must step out into the world and work with the crimefighters to bring the suspects to justice.

But are there more dangerous forces at work than they realize?