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Choudenshi Bioman was the 8th Super Sentai and aired in 1984.

500 years ago the Bio Robo traveled to Earth from the Bio Star and showered five people it discovered with Bio Particles. In the present day, Doctor Man tries to take over Earth with his mechanized followers, Neo Empire Gear. Now the robot Peebo must gather the people whose ancestors were infused with the Bio Particles to become Bioman and save the world.

The Biomen are:

• Gou Shiro/Red One: The pilot of Japan's first space shuttle before becoming the leader of Bioman. His Bio powers include being able to understand the speech of animals.
• Takasugi Shingo/Green Two: The Big Guy.
• Nanbara Ryuuta/Blue Three: A water sportsman and the youngest member of the team.
• Koizumi Mika/Yellow Four (I): A photographer who's Killed Off For Real in episode 10. Yabuki Jun, who was in training for the Japanese Olypmic archery team, took her place.
• Yabuki Jun/Yellow Four (II): An Olympic archer, replaced Mika after Mika was Killed Off For Real. Very much an Action Girl; her actress is an experienced stuntwoman, and she did lots of her own stunts in the show.
• Katsuragi Hikaru/Pink Five: The Chick and Team Mom. A flutist descended from a noblewoman.

The main units of Gear are:

• Doctor Man/ aka Hideo Kageyama: The Mad Scientist Big Bad.
• The Big Three: Gear's three dragons
  • Mason: The leader of the three.
  • Monster: The Brute, very much a Dumb Muscle.
  • Farrah: The Dark Chick. She prefers cunning espionage in her schemes.
    • Farrahcat: Farrah's loyal bodyguard. The Non Serial Movie gave her an Amazon Brigade.
• Beastnoids: The Quirky Miniboss Squad.
  • Beast King: Monster's loyal sidekick, who much like his master is a Dumb Muscle.
  • Psygorn: A three-faced mentalist and frequent favorite of Mason.
  • Metzler: A Cyber Cyclops used for espionage, much like his frequent patron, Farrah.
  • Messerbeast: A Winged Humanoid and the first of the five to see combat, and one of the first to go.
  • Aquaiger: A fishman robot who bites it along with Messerbeast.
• Mechaclones: The Mecha Mooks

• And on his own side:
  • Bio-Hunter Silver: a robot who helped cause the destruction of the Bio Star. Fights both the Biomen (he's programmed to kill anything with Bio Particles) and Gear (who want to steal his missing Humongous Mecha, Balzion).

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Recurring Super Sentai tropes:

• All Your Powers Combined: A few of the team attacks involve this.
• Base Of Operations:
• By The Power Of Greyskull: "Bioman!"; or, their individual names.
• Calling Your Attacks:
• Combining Mecha: BioRobo.
• Finishing Move: The Biomen and BioRobo have a plethora of them.
• Five Man Band
  • The Hero: Shirou
  • The Lancer: Mika/ Shingo  ^*
    ^{Who can also qualify for Genius Bruiser status.}
  • The Big Guy: Shingo/ Jun.
  • The Smart Guy: Ryuuta  ^*
    ^{He's quite skilled in stealth, despite also being Plucky Comic Relief.}
  • The Chick: Hikaru
  • The Sixth Ranger: Subverted; despite his debut episode being called "The Sixth Man," Minor Character Of The Week Yatori doesn't stick around afterwards.  ^*
    ^{And when he does get a Henshin in the following episode, he's Brainwashed And Crazy by Gear.}
  • Team Pet: Peebo, despite also being The Mentor
• Humongous Mecha: BioRobo.
• In The Name Of The Moon: The individual names, followed by "One! Two! Three! Four! Five! ChouDenshi Bioman!.
• Law Of Chromatic Superiority:
• Make My Monster Grow: Absent. Gear has five human-sized monsters it uses over and over and a different giant monster in each episode. As this prevented the giant monsters from having much of an identity (not to mention probably kept Toei from getting much of a return on investing in the costumes), this approach has pretty much stayed unique to Bioman.
• Mooks: Mechaclones.
• The Movie:
• On The Next Episode Of Catch Phrase:
• Regular Caller:
• Robot Buddy: Peebo, again.
• Supervillain Lair:
• Theme Music Power Up:
• Transformation Trinket: Techno Braces
• Weapon Of Choice

  • Swiss Army Weapon: The Biomen's side arms are pistols, which can switch to sword and dagger modes.

  • Straight Arrow: Jun, being an archer, is the only one with a Weapon Of Choice. Her weapon even enlarges for a Finishing Move.

Tropes specific to Choudenshi Bioman

• Battle Cry: Gear personnel shout "For the Man!"
• Chaotic Neutral: Bio Hunter Silver.
• Forgotten Fallen Friend: Mika is totally forgotten about after her death (save for one time in episode 37) and it seems as if Jun had always been there instead. Although since Mika's actress left the show abruptly its understandable.
• Hilarious In Hindsight: The Filipino English dub named Hikaru Kimberly.
• Infinite Supplies: How the Biomen can live without jobs.
• Mid Season Upgrade: Gear switches to stronger robot monsters, so the Biomen receive an extra-boost in Bio Particles  ^*
  ^{resulting in them and the Bio Robo reverting to a singular Finishing Move each}
  . The three remaining Beastnoids are also rebuilt into stronger forms.
• Real Life Writes The Plot: The actress that played the first Yellow Four left due to some shady circumstances that even today aren't quite clear. Some claim she had a falling out with J.A.C. the stuntworkers union that Sentai hired most of its early actors from, while fellow cast members believe she eloped with someone. Either way the actress hasn't been heard from since then.
• Replacement Goldfish: The Black Prince, a Mecha Clone replica of Doctor Man's son, Shuichi. Subversion: Shuichi is actually alive.
• The Starscream: Mason attempted a coup...only to learn Doctor Man was ready for it
• Substitute Teacher: Episodes 15 and 16 were obviously written with Mika in mind.
• Suicide Attack: One episode had Gear use the Mechaclones as walking bombs.
• Synchronization: One Robot Monster had a counterpart Mechaclone, a Mac Guffin Girl named Miki, whose existence allowed him to regenerate damage. She did a Heroic Sacrifice to stop that.
• Unfriendly Fire: Mason, using Metal Megas, blasts the Biomen and the five Beastnoids, which destroys Aquaiger and Messerbeast.
• Unfunny Aneurysm Moment: The team has a hard time convincing Mika to join them. She finally accepts, only to be killed 8 episodes later. Also Hilarious In Hindsight, because the team would have been better off leaving Mika alone and looking for somebody else in the first place.
• Was Once A Man/ Meaningful Name: There's a reason why the villain's named Doctor Man.

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