Summary: Eldran piloting the mecha Raijin-Oh crash lands into Hinobori's elementary school. With the last of his powers, Eldran saves the ones in the school at the moment: class 3 of the 5th grade. He entrust them with Raijin-Oh and the duties to protect the Earth, while Eldran goes into hibernation to recover his powers.
Episode 2: We Are the Earth Defense Class
Air Date: April 10th, 1991
Summary: Class 5-3 gets a visit from the army, demanding to hand over Raijin-Oh. The arguing is interruped when Jaku Beast Dustoron is running loose in the city. After finding out that only Class 5-3 can operate Raijin-Oh, the army has no choice but leave Class 5-3 alone.
Episode 3: Tests Are a Huge Annoyance!?
Air Date: April 17th, 1991
Summary: The entire Class 5-3 average match score of the last test is far below the rest of the other classes and needs to do a retest. Asuka, Kouji, Maria and Tsutomu are assigned to help Jin with his studies as his test score is zero. Jin tries to run away, but in the end can't escape.
The next day, right before the retest, Jaku Beast Testora appears and Class 5-3 needs to sortie. After defeating the Jaku Beast, Class 5-3 does the retest much to the dismay of Jin.
A couple of days later the tests are graded and Jin has 80 points.
Episode 4: Protect the Field of Flowers!
Air Date: April 24th, 1991
Summary: During an excursion, the boys of class 5-3 gets into a fight with the boys from the local. Meanwhile Kouji meets a girl called Kozue, who explains that the locals are angry that more and more trees are being cut for the expansion of the park for tourists.
The next day, Class 5-3 hears that Onoboori mountain (the place they went yesterday) became treeless and a Jaku Beast is attacking. Still remembering the fight, Jin is reluctant to sortie. Kouji insist, saying it's their duty as the defenders of Earth and manage to convince everyone including Jin. With the help of the locals Raijin-Oh manage to defeat the Jaku Beast.
Episode 23: Come Forth! Absolutely Invincible Union!!
Air Date: September 4th, 1991
Episode 24: Dog/Cat Panic Plan!
Air Date: September 11st, 1991
Episode 25: Getting the Scoop!!
Air Date: September 18th, 1991
Episode 26: Great African Battle!
Air Date: September 25th, 1991
Episode 27: Defeat the Earthquake
Air Date: October 2nd, 1991
Episode 28: Garuma's Competition of Fear!!
Air Date: October 9th, 1991
Episode 29: Appear! Super Jaaku Beast
Air Date: October 16th, 1991
Episode 30: Jaaku beast is a Friend?
Air Date: October 23rd, 1991
Episode 31: Fierce Battle! Channel War
Air Date: October 30th, 1991
Episode 32: Adventure in the Haunted House
Air Date: November 6th, 1991
Episode 33: Terror! Dancing Jaaku Beast
Air Date: November 13rd, 1991
Episode 34: Skiing is Too Cold
Air Date: November 20th, 1991
Episode 35: Vanished Commander
Air Date: November 27th, 1991
Episode 36: Jaaku Beast is an Ally of Justice!?
Air Date: December 4th, 1991
Episode 37: Graffiti Revolt
Air Date: December 11st, 1991
Episode 38: Psychic Jin
Air Date: December 18th, 1991
Episode 39: The Celebration is a Troubling Thing
Air Date: December 25th, 1991
Episode 40: Belzeb's Great Approach
Air Date: January 1st, 1992
Episode 41: Kidnapping of the Absolutely Invincible
Air Date: January 8th, 1992
Episode 42: Protect the Secret of the School!
Air Date: January 15th, 1992
Episode 43: Super Giant Reiko Appears!
Air Date: January 22nd, 1992
Episode 44: Decisive Micro-Battle!
Air Date: January 29th, 1992
Episode 45: Broadcast! Earth Defense Class Facts!!
Air Date: February 5th, 1992
Episode 46: Taida Becomes an Earthling
Air Date: February 12nd, 1992
Episode 47: Adult to Child Chaos!?
Air Date: February 19th, 1992
Episode 48: Transformation! Black Taida
Air Date: February 26th, 1992
Episode 49: Appear! Jaaku Empire
Air Date: March 4th, 1992
Episode 50: Defeat Emperor Warza!
Air Date: March 11st, 1992
Episode 51: Our Dream is Absolutely Invincible!
Air Date: March 18th, 1992
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