Chōdenshi Bioman (Super Electronic Bioman) is the eighth Super Sentai and aired from 1984 to 1985.500 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.
Jun Yabuki/Yellow Four II: An Olympic archer who replaces Mika in Episode 11. Presumably shares the same ancestor as Mika. Very much an Action Girlnote Justified that she is physically stronger than her teammates; her actress is an experienced stuntwoman, and she did lots of her own stunts in the show.
Hikaru Katsuragi/Pink Five: The Chick and Team Mom. A flutist descended from a noblewoman.
Bio-Hunter Silva: A robot who helped cause the destruction of the Bio Star. Fights both the Bioman team (he's programmed to kill anything with Bio Particles) and Gear (who want to steal his missing Humongous Mecha, Bulgeon).
Color-Coded Characters: The codename pattern consists of using each member's color as the head word and a corresponding number as the tail. This is the number in which the team, in their original composition, first transformed.
Custom Uniform: Yellow Four and Pink Five wear panties molded into their suits. This also happened with the respective female duos from the nexttwo Sentai teams.
Eye Catch: The eyecatch features a normal version of Red One and small versions of (Clockwise from bottom left) Blue Three that seems to be sliding from Red One's right shoulder, Pink Five that seems to be performing a superkick, Green Two who seems to be levitating from Red One's left shoulder and Yellow Four. The title card is also seen in the bottom right of the screen. After the break, Bio Robo is shown who seems to be running and holding the bio sword. The Title Card can be seen on the bottom left of the screen.
Sixth Ranger: Subverted; One-Shot Character Shōta Yamamori doesn't stick around despite debuting in an episode titled "The Sixth Man", and even pretending to join in the group henshin. note When he does transform into the Magne Senshi during the following episode, he's Brainwashed and Crazy by Gear.
Make My Monster Grow: Absent. Gear has five human-sized monsters called the Junoids, which they use over and over and a different giant mecha in each episode. As this prevented the giant monsters from getting much screentime (and thus Toei from getting much of a return on investment), this approach has pretty much stayed unique to Bioman.
Monster of the Week: Giant robots known as "Mecha Gigants". From Episode 31 and onward, they're replaced by a series of newer models known as "Neo Mecha Gigants". The newer robots are also unique in that they're piloted by a member of Big Three, while the previous generation of robots (usually) weren't piloted.
The Movie: Takes place sometime after Episode 11 (after Jun Yabuki joins the team), but before Episode 31 (while all five Junoids are still alive).
Two Girls to a Team: Introduced this trope to Super Sentai with the inclusion of Yellow Four and Pink Five. This helped codify yellow as a gender-neutral color that can be worm by both male and female rangers, and established Yellow and Pink as the standard colors for a female duo.
Swiss-Army Weapon: The Bio Swords. note Gun and Blade modes. Each Bioman has a unique blade mode as well. note Fire Sword for Red One, Hurricane Sword for Green Two, Elec Sword for Blue Three, Thunder Sword for Yellow Four, and Laser Sword for Pink Five
Fake Shemp: For Mika's last episode, her voice was dubbed over by an uncredited Mayumi Tanaka as Yuki Yajima had only completed ADR for the first nine episodes.
Forgotten Fallen Friend: Mika is never mentioned after her death (save for one time in Episode 37, and even then they only mention her by her codename) and it seems as if Jun has always been Yellow Four instead. Although this is understandable, considering Yuki Yajima's abrupt departure from the series.
Four Is Death: The first Yellow Four, who was killed off after her actress left the set.
Heroic BSOD: Peebo is terrified of Silva when he first appears, running away and getting as close to a fetal position as he can. (He recovers enough by the end of the episode to assists the team. From a distance.)
Identical Grandson: The ancestors of the team who were showered with the Bio-Particles are played by the same actors as their descendants. This became a bit problematic for the show's creators once Mika was replaced with Jun, which is probably why the ancestors were never shown again and the repeated showings of the first flashback were often edited to leave out Mika's ancestor.
Jumped at the Call: A little subversion. At first, Shirou, Shingo, Ryuuta, Mika and Hikaru didn't quite buy Peebo's story, until Gear attacks and forces them to morph and eventually accept their duty... except Mika who went away, only to eventually rejoin next episode.
Kick the Dog: Did you have to go and blow up Red One's bird? (However, it was less For the Evulz and because of the chance of Red One using his Dr. Doolittle skills to ask the bird about the evil plan du jour.)
McLeaned: The death of Mika is a text-book example of this, due to the actress' sudden departure.
Mid-Season Upgrade: Gear switches to stronger robot monsters and upgrade the big three, so the Biomen receive an extra-boost in Bio Particles note 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: Yuki Yajima, the actress who 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.