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 Girl; 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).
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.
Finishing Move: The Biomen and BioRobo have a plethora of them.
BioRobo actually had the largest number of individual sword finishers of any Sentai mecha.
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. *
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 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. However, Tokusou Sentai Dekaranger would have the alien criminal Monster of the Week (or an Elite Mook accompanying him) pilot a giant robot of the week while the criminal stayed human sized (though it should be noted a lot were upgraded models of previously seen mecha).
Monster of the Week: The Mecha Gigan giant robots. From Episode 31 and onward, they're replaced by a series of improved models known as Neo Mecha Gigans.
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 codified yellow as a gender-neutral color that can be worm by both, male and female rangers, as well as establish Yellow and Pink as the standard colors for a female duo.
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.
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.)
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.
The Starscream: Mason attempted a coup...only to learn Doctor Man was ready for it
Suicide Attack: One episode had Gear use the Mechaclones as walking bombs.
Synchronization: One Robot Monster had a counterpart Mechaclone, a MacGuffin Girl named Miki, whose existence allowed him to regenerate damage. She did a Heroic Sacrifice to stop that.
Temporary Substitute: Episodes 15 and 16 were obviously written with Mika in mind.