As Professor Deviler steals robots to build the Iron Alliance, he kidnaps SSI agent Ken Kurenai's brother Kenshiro to get control of Red Baron. But Kenshiro has plans to prevent this from happening by giving Red Baron to Ken.
After Professor Deviler kills Ken's brother Kenshiro, Ken vows revenge against the Iron Alliance, which may be short lived as Deviler kidnaps Ken for the sole purpose in turning him into a human slave to get control of Red Baron.
Deviler creates a android duplicate of Ken's brother Kenichiro as part of his plan to take over Earth. But when Red Baron goes up against the Japanese built robot Hiryu, Deviler plays a hand which may allow him to defeat Red Baron easily.
After Deviler uses the android of Kenichiro to defeat Red Baron and make it inoperable, Deviler goes ahead with his plan to make human slaves. To stop Deviler, Ken needs Red Baron's schematics, the bad news is that the location is unknown.
The SSI team discovers that a little rain can be a bad thing when they find out the reason behind Deviler's artificial rain experiments: it increases Deviler's robot Goryu's destructive power, as Red Baron soon finds out first hand.
Deviler tries out a new plan to take control of Red Baron: taking possession of Ken's control unit to gain control of the robot. But when this doesn't work out as planned, it may give Deviler the chance to stop the SSI team one and for all.
It's not the red balloons that are the threat, it's what's attached to them: children's toys that give Deviler the chance to control the Bicycle Inspector's little friends, and to ensure victory for his latest robot.
When Deviler's latest robot has a reflection weapon that makes it unstoppable, the SSI team finds the inventor of the weapon to try to find a weakness in the weapon, but he refuses to help. Is Red Baron and the SSI team doomed to failure?
Bicycle Inspector Kumano's investigation of a murder scene leads him to an uranium mine which, unknown to Kumano, is being used by Deviler and the Iron Alliance as a setting in a trap for Red Baron.
The SSI team has it's hands full trying to find the operators of a destructive ray that is giving Deviler's latest robot the upper hand in it's battle with Red Baron.
Mari finds a really big thorn in the dozen roses she gets for her birthday, a needle injecting her with a microscopic transmitter that compels her to do Deviler's and the Iron Alliance's bidding.
When Deviler finds out that Dr. Odagiri is returning to Japan to build a robot that is more powerful than Red Baron, he decides to take care of this problem, by brainwashing Tetsuya into assassinating Dr. Odagiri.
While investigating the reason behind murder of his friends by the Iron Alliance, Captain Daigo, then Ken, is arrested by police under Deviler's control, so his plan to destroy five major Japanese cities can go off without a hitch.
A toy robot becomes a problem the size of Red Baron when Deviler replaces the robot that Daisuku's repairing for his little brother with a duplicate so Ken and Red Baron receive the wrong information on how to destroy Deviler's Bull Robot.
Ken Kurenai has just been tracked down by his fellow SSI agents and killed by Captain Daigo. Then, Ken wakes up in a cold sweat. But Deviler knows all about Ken's nightmare and is about to turn it into reality.
The SSI team must find and protect a human slave that escaped from the Iron Alliance before the Iron Alliance does, for the same reason: He may have information on Deviler's plans of attack that uses nerve gas.
After a girl saves Bicycle Inspector Kumano after he is trapped in a cave, he grants her her fondest wish: To be able to fly. But the girl may be the key for Deviler to be able to finally destroy Red Baron once and for all.
After the rest of the SSI team are called to the woods by Daisuku after Mari was apparently eaten by the giant snake she was investigating, they see Red Baron being beaten and destroyed. Has Deviler finally achieved the impossible?
Ken and Red Baron go up against Magma Wolf, a robot piloted by it's creator's daughter, a woman with a vendetta against mankind due to how mistreated her father was by everyone to the point of him committing suicide.
The S.S.I. team raids one of Deviler's plants and arrests his second in command. But when Deviler retrieves him, kidnaps Mari, and sends out a robot to destroy Tokyo, will Red Baron save the day, even if Mari's life hangs in the balance?
While protecting a man who escaped from the Iron Alliance, Ken and the escapee are trapped in a cabin while Deviler commences an operation to take control of Red Baron by reprogramming the robot, something Ken may not be able to prevent.
Deviler and the Iron Alliance set forth on their latest plan to stop Red Baron: Attacking sources of a special oil that Red Baron needs to remain operational.
Angel Killer, an alien, comes to Earth with his robot, Sky Shark, on a mission to destroy Red Baron, and has a weapon to can do just that. Can Angel Killer achieve what Deviler has repeatedly failed to accomplish?
Angel Killer escalates his battle against S.S.I., while the team races against time to find a defense against Sky Shark's deadly weapon. Meanwhile, Deviler finds out the true reason why Angel Killer has come to Earth.
After the battle with Shy Shark, the S.S.I. team decides to modify Red Baron to help face threats from outer space. Meanwhile, in order to defeat Red Baron, Deviler decides to get all the information he needs by kidnapping a S.S.I. member.
As Red Baron continues it's fight against the robot King Deviler, the rest of the S.S.I. team infiltrates Deviler's underwater headquarters on a mission to destroy it. But the S.S.I. members soon find out, this mission comes with a price.
Red Baron has been improved, and the S.S.I. team gets a new member, and not a moment too soon, as the Iron Alliance continues it's war against Red Baron, this time striking out from the reaches of space.
