I created these indexes for myself to get a better grip on the series as a whole. Currently it isn't possible to watch the whole series of 52 episodes in english because 10 of those episodes are currently "lost." I think there are episodes that are important to the arc of the life of the 8th Man and those episodes are those written by series co creator and writer Kazumasa Hirai.
8th Man - Index by Writer
KAZUMASA HIRAI:
#1 THE STORY OF HOW 8TH MAN CAME TO BE
- "Eight Man Appearance"
#2 ICEFINGER THE EXECUTIONER
- "Hit Man Gaea ream"
#3 THE CRUEL CLOWN
- "The Sibling of Satan"
#4 THE ELEVATOR TRAP
- "Capital Punishment Stand B3"
#8 DR. SPECTRA
- "Super Small-sized Missile"
#9 THE LIGHT THAT BURNED
- "Light Ray Gun Laser"
#10 SAMANTHA 7
- "Robot 007"
#11 THE BELLIGERENT BODYGUARD
- "Assassin of Vision"
#14 THE RACING ROCKETS
- "Super Pilot"
#19 THE ATTACK ON INTERCRIME ISLAND
- "Counterattack of Gaea ream"
#21 POUNCE THE ROBOT TIGER
- "Robot Tiger"
#22 THE THREAT OF DISASTER
- "Zero Challenge"
#25 THE ELECTRONIC TYRANT
- "Superhuman Rhinoceros Bar (Saibba)"
#30 THE ARMORED MAN
- "Cyborg Human Number C1"
#31 GHOST HIGHWAY
- "Ghost Highway"
#32 THE SOLAR SATELLITE
- "Solar Satellite Thunder"
#34 BATTLE OF THE BROTHERS
- "Duel"
#37 7 DAYS OF TERROR
- "7 Days of Nightmare"
#40 INTERCRIMES INVINCIBLE ROBOT
- "Transparent Robot Jupiter"
#43 THE NUCLEAR WITCH
- "The ESP Witch"
#45 THE ATTACK OF TARANTULA
- "Tarantula Condemned Criminal"
#49 30 HUNDRED MILLION HOSTAGES
- "30 Hundred Million Hostages"
#55 SUPER MANKIND MUTANT (PART 1)
#56 SUPER MANKIND MUTANT (PART 2)

NAKAMURA RYOU:
#5 DR. SINISTER & THE BLACK FOG MOB
- "The Dark Capsule"
#18 BARON STORMY
- "Typhoon Baron"
#20 MISGUIDED MACHINES
- "Spy Order 100"

ONUKI TETSUYOSHI (Onuki Satoru):
#6 GOLDSHRINKER AND THE NUMBERS GANG
- "Golden Gang"
#13 BAT MASTER AND THE ROBOT BATS
- "Human Hollerith Card"

TOYOTA ARITSUME (TSUNE TOYOTA):
#7 THE SILENT JETS
- "Sound Arresting Jet Aircraft"
#12 RASCAL FISH AND THE PIRATE SUBMARINE
- "Uranium of Seabed"
#15 THE SHADOW BANDITS
- "Black Ghost"
#24 THE STEEL SALAMANDER
- "Salamander Maneuvers"
#26 COUNTDOWN TO ZERO
- "Earth Zero Hour"
#36 BYRUS 13
- "Virus 13" by Toyota Aritsume (Tsune Toyota)
#39 THE ELECTRONIC PHANTOMS
- "Boy which makes Vision"
#42 ATTACK OF THE HORRIBLE HONEY BEES
- "Queen Bee Monster"
#51 THE TERRIBLE IMITATION PEOPLE
- "Aim for the Earth"
#52 THE SAVAGE FISH
- "Piranha Fish Food: Human"
#54 RULE OF THE SHARKS
- "Rule"

KATSURA MASAYOSHI:
#16 THE GOLD BEETLE OF ORIENTIA
- "Mysterious Thief Gold Beetle"
#17 THE SONIC SLICER
- "Ultrasonic Doctor"
#23 THE RETURN OF NAPOLEON BONAPARTE
- "Napoleonic World 13"
#27 THE MONSTER EELER
- "Large Monster Eera"
#28 EVIL JAW AND THE DEVIL GERMS
- "Bacterium Maneuvers"
#29 THE PASSENGER ROCKET ADVENTURE
- "Human Missile"
#44 THE THUNDERMAKER
- "Worldwide Lightning Plan"
#53 REBELLION OF MUTARL
- "Rebellion"

KANO ICHIRO:
#33 ARTIFICIAL LIFE: VALCOUN
- "Artificial Life: Valkan"
#35 THE FREEZING RAY
- "Freezing Light Ray"
#38 THE ATOMIC GHOST
- "Mysterious Human Ghost"
#41 TARGET 8TH MAN
- "8 Man Assassination Order"
#46 THE MONSTER BIRD
- "Sky Majin"
#47 OPERATION BUBBLE BALL
- "Bubble Ball Maneuvers"
#48 THE MENACE FROM OUTER SPACE
- "Mars Human SAW"
#50 THE LIVING STATUE
- "Mysterious Image Giant"
_______________________________________________________

8th Man - Index by Character
TOBOR / 8th MAN:
Every episode

CHIEF FUMBLETHUMBS:
Every episode except:

PROFESSOR GENIUS:
Every episode except:

JENNY HEARTSWEET:
Every episode except:

SKIP PEPPER:
Episodes:
___________________

DR. GHOST:
#37 7 DAYS OF TERROR
- "7 Days of Nightmare" by Kazumasa Hirai
#41 TARGET 8TH MAN
- "8 Man Assassination Order" by Kano Ichiro

ICEFINGER THE EXECUTIONER (aka: Coldnuckle):
#2 ICEFINGER THE EXECUTIONER
- "Hit Man Gaea ream" by Kazumasa Hirai
#19 THE ATTACK ON INTERCRIME ISLAND
- "Counterattack of Gaea ream" by Kazumasa Hirai
#40 INTERCRIMES INVINCIBLE ROBOT
- "Transparent Robot Jupiter" by Kazumasa Hirai

DR. KATHRYN RATIONAL:
#9 THE LIGHT THAT BURNED
- "Light Ray Gun Laser" by Kazumasa Hirai
#26 COUNTDOWN TO ZERO
- "Earth Zero Hour" by Toyota Aritsume (Tsune Toyota)
#48 THE MENACE FROM OUTER SPACE
- "Mars Human SAW" by Kano Ichiro

MR. PLUNDER OF INTERCRIME:
#19 THE ATTACK ON INTERCRIME ISLAND
- "Counterattack of Gaea ream" by Kazumasa Hirai
#21 POUNCE THE ROBOT TIGER
-"Robot Tiger" by Kazumasa Hirai
#49 30 HUNDRED MILLION HOSTAGES
- "30 Hundred Million Hostages" by Kazumasa Hirai

DR. SPECTRA (Dr. Demon):
#8 DR. SPECTRA
- "Super Small-sized Missile" by Kazumasa Hirai
#19 THE ATTACK ON INTERCRIME ISLAND
- "Counterattack of Gaea ream" by Kazumasa Hirai
#21 POUNCE THE ROBOT TIGER
-"Robot Tiger" by Kazumasa Hirai
#24 THE STEEL SALAMANDER
-"Salamander Maneuvers" by Toyota Aritsume (Tsune Toyota)
#32 THE SOLAR SATELLITE
- "Solar Satellite Thunder" by Kazumasa Hirai
#33 ARTIFICIAL LIFE: VALCOUN
- "Artificial Life: Valkan" by Kano Ichiro w/Brother Dr. Lebo
#36 BYRUS 13
- "Virus 13" by Toyota Aritsume - w/Daughter Dorothea Spectra
#40 INTERCRIMES INVINCIBLE ROBOT
- "Transparent Robot Jupiter" by Kazumasa Hirai
#46 THE MONSTER BIRD
- "Sky Majin" by Kano Ichiro w/Brother Dr. Lebo
#55 SUPER MANKIND MUTANT (PART 1) by Kazumasa Hirai
#56 SUPER MANKIND MUTANT (PART 2) by Kazumasa Hirai
_______________________________________________________

8th Man - Index by Crime Group
The BLACK BUTTERFLY GANG:
#9 THE LIGHT THAT BURNED
- "Light Ray Gun Laser" by Kazumasa Hirai
#22 THE THREAT OF DISASTER
- "Zero Challenge" by Kazumasa Hirai
#28 EVIL JAW AND THE DEVIL GERMS
- "Bacterium Maneuvers" by Katsura Masayoshi
#37 7 DAYS OF TERROR
- "7 Days of Nightmare" by Kazumasa Hirai
#38 THE ATOMIC GHOST
- "Mysterious Human Ghost" by Kano Ichiro
#41 TARGET 8TH MAN
- "8 Man Assassination Order" by Kano Ichiro
#55 SUPER MANKIND MUTANT (PART 1) by Kazumasa Hirai
#56 SUPER MANKIND MUTANT (PART 2) by Kazumasa Hirai

Pre-INTERCRIME:
#2 ICEFINGER THE EXECUTIONER
- "Hit Man Gaea ream" by Kazumasa Hirai
#6 GOLDSHRINKER AND THE NUMBERS GANG
- "Golden Gang" by Onuki Tetsuyoshi (Onuki Satoru)
#7 THE SILENT JETS
- "Sound Arresting Jet Aircraft" by Toyota Aritsume (Tsune Toyota)
#8 DR. SPECTRA
- "Super Small-sized Missile" by Kazumasa Hirai
#9 THE LIGHT THAT BURNED
- "Light Ray Gun Laser" by Kazumasa Hirai
#13 BAT MASTER AND THE ROBOT BATS
- "Human Hollerith Card" by Onuki Tetsuyoshi (Onuki Satoru)

INTERCRIME:
#19 THE ATTACK ON INTERCRIME ISLAND
- "Counterattack of Gaea ream" by Kazumasa Hirai
#21 POUNCE THE ROBOT TIGER
- "Robot Tiger" by Kazumasa Hirai
#24 THE STEEL SALAMANDER
- "Salamander Maneuvers" by Toyota Aritsume (Tsune Toyota)
#32 THE SOLAR SATELLITE
- "Solar Satellite Thunder" by Kazumasa Hirai
#33 ARTIFICIAL LIFE: VALCOUN
- "Artificial Life: Valkan" by Kano Ichiro
#36 BYRUS 13
- "Virus 13" by Toyota Aritsume (Tsune Toyota)
#40 INTERCRIMES INVINCIBLE ROBOT
- "Transparent Robot Jupiter" by Kazumasa Hirai
#46 THE MONSTER BIRD
- "Sky Majin" by Kano Ichiro
#49 30 HUNDRED MILLION HOSTAGES
- "30 Hundred Million Hostages" by Kazumasa Hirai
#55 SUPER MANKIND MUTANT (PART 1) by Kazumasa Hirai
#56 SUPER MANKIND MUTANT (PART 2) by Kazumasa Hirai

The REPUBLIC of ARMACO:
#10 SAMANTHA 7
- "Robot 007" by Kazumasa Hirai
#34 BATTLE OF THE BROTHERS
- "Duel" by Kazumasa Hirai
#37 7 DAYS OF TERROR
- "7 Days of Nightmare" by Kazumasa Hirai

UNAFFILIATED CRIME GANGS:
#3 THE CRUEL CLOWN
- "The Sibling of Satan" by Kazumasa Hirai
#4 THE ELEVATOR TRAP
- "Capital Punishment Stand B3" by Kazumasa Hirai
#5 DR. SINISTER & THE BLACK FOG MOB
- "The Dark Capsule" by Nakamura Ryou
#6 GOLDSHRINKER AND THE NUMBERS GANG
- "Golden Gang" by Onuki Tetsuyoshi (Onuki Satoru)
#12 RASCAL FISH AND THE PIRATE SUBMARINE
- "Uranium of Seabed" by Toyota Aritsume (Tsune Toyota)
#13 BAT MASTER AND THE ROBOT BATS
- "Human Hollerith Card" by Onuki Tetsuyoshi (Onuki Satoru)
#15 THE SHADOW BANDITS
- "Black Ghost" by Toyota Aritsume (Tsune Toyota)
#16 THE GOLD BEETLE OF ORIENTIA
- "Mysterious Thief Gold Beetle" by Katsura Masayoshi
#17 THE SONIC SLICER
- "Ultrasonic Doctor" by Katsura Masayoshi
#18 BARON STORMY
- "Typhoon Baron" by Nakamura Ryou
#23 THE RETURN OF NAPOLEON BONAPARTE
- "Napoleonic World 13" by Katsura Masayoshi
#35 THE FREEZING RAY
- "Freezing Light Ray" by Kano Ichiro
#39 THE ELECTRONIC PHANTOMS
- "Boy which makes Vision" by Toyota Aritsume (Tsune Toyota)
#44 THE THUNDERMAKER
- "Worldwide Lightning Plan" by Katsura Masayoshi
#45 THE ATTACK OF TARANTULA
- "Tarantula Condemned Criminal" by Kazumasa Hirai
#47 OPERATION BUBBLE BALL
- "Bubble Ball Maneuvers" by Kano Ichiro
_______________________________________________________

8th Man - Miscellaneous Index
COMPUTERS:
#20 MISGUIDED MACHINES
- "Spy Order 100" by Nakamura Ryou
#25 THE ELECTRONIC TYRANT
- "Superhuman Rhinoceros Bar (Saibba)" by Kazumasa Hirai

INVENTIONS - Non Robotic:
#7 THE SILENT JETS
- "Sound Arresting Jet Aircraft" by Toyota Aritsume (Tsune Toyota)
#8 DR. SPECTRA
- "Super Small-sized Missile" by Kazumasa Hirai
#9 THE LIGHT THAT BURNED
- "Light Ray Gun Laser" by Kazumasa Hirai
#17 THE SONIC SLICER
- "Ultrasonic Doctor" by Katsura Masayoshi
#18 BARON STORMY
- "Typhoon Baron" by Nakamura Ryou
#24 THE STEEL SALAMANDER
- "Salamander Maneuvers" by Toyota Aritsume (Tsune Toyota)
#32 THE SOLAR SATELLITE
- "Solar Satellite Thunder" by Kazumasa Hirai
#35 THE FREEZING RAY
- "Freezing Light Ray" by Kano Ichiro
#36 BYRUS 13
- "Virus 13" by Toyota Aritsume (Tsune Toyota)
#39 THE ELECTRONIC PHANTOMS
- "Boy which makes Vision" by Toyota Aritsume (Tsune Toyota)
#41 TARGET 8TH MAN
- "8 Man Assassination Order" by Kano Ichiro
#44 THE THUNDERMAKER
- "Worldwide Lightning Plan" by Katsura Masayoshi
#47 OPERATION BUBBLE BALL
- "Bubble Ball Maneuvers" by Kano Ichiro

METEOROLOGICAL:
#18 BARON STORMY
- "Typhoon Baron" by Nakamura Ryou
#32 THE SOLAR SATELLITE
- "Solar Satellite Thunder" by Kazumasa Hirai
#35 THE FREEZING RAY
- "Freezing Light Ray" by Kano Ichiro
#44 THE THUNDERMAKER
- "Worldwide Lightning Plan" by Katsura Masayoshi

MUTATIONS OF NATURE:
#27 THE MONSTER EELER
- "Large Monster Eera" by Katsura Masayoshi
#31 GHOST HIGHWAY
- "Ghost Highway" by Kazumasa Hirai
#33 ARTIFICIAL LIFE: VALCOUN
- "Artificial Life: Valkan" by Kano Ichiro
#42 ATTACK OF THE HORRIBLE HONEY BEES
- "Queen Bee Monster" by Toyota Aritsume (Tsune Toyota)
#46 THE MONSTER BIRD
- "Sky Majin" by Kano Ichiro
#52 THE SAVAGE FISH
- "Piranha Fish Food: Human" by Toyota Aritsume (Tsune Toyota)

POLITICAL STRUGGLES:
#11 THE BELLIGERENT BODYGUARD
- "Assassin of Vision" by Kazumasa Hirai
#20 MISGUIDED MACHINES
- "Spy Order 100" by Nakamura Ryou
#23 THE RETURN OF NAPOLEON BONAPARTE
- "Napoleonic World 13" by Katsura Masayoshi
#26 COUNTDOWN TO ZERO
- "Earth Zero Hour" by Toyota Aritsume (Tsune Toyota)
#32 THE SOLAR SATELLITE
- "Solar Satellite Thunder" by Kazumasa Hirai

ROBOTS:
#10 SAMANTHA 7
- "Robot 007" by Kazumasa Hirai w/ Samantha 7
#13 BAT MASTER AND THE ROBOT BATS
- "Human Hollerith Card" by Onuki Tetsuyoshi (Onuki Satoru)
#21 POUNCE THE ROBOT TIGER
-"Robot Tiger" by Kazumasa Hirai w/ Pounce
#23 THE RETURN OF NAPOLEON BONAPARTE
- "Napoleonic World 13" by Katsura Masayoshi w/robot princess
#30 THE ARMORED MAN
- "Cyborg Human Number C1" by Kazumasa Hirai w/ Armored Man
#34 BATTLE OF THE BROTHERS
- "Duel" by Kazumasa Hirai w/ Ken Genius
#37 7 DAYS OF TERROR
- "7 Days of Nightmare" by Kazumasa Hirai w/ Enon X0-5
#40 INTERCRIMES INVINCIBLE ROBOT
- "Transparent Robot Jupiter" by Kazumasa Hirai w/Jupiter

ROCKETS:
#14 THE RACING ROCKETS
- "Super Pilot" by Kazumasa Hirai
#26 COUNTDOWN TO ZERO
- "Earth Zero Hour" by Toyota Aritsume (Tsune Toyota)
#29 THE PASSENGER ROCKET ADVENTURE
- "Human Missile" by Katsura Masayoshi

SPACE ALIENS:
#28 EVIL JAW AND THE DEVIL GERMS
- "Bacterium Maneuvers" by Katsura Masayoshi
#51 THE TERRIBLE IMITATION PEOPLE
- "Aim for the Earth" by Toyota Aritsume (Tsune Toyota)
#48 THE MENACE FROM OUTER SPACE
- "Mars Human SAW" by Kano Ichiro

SUPERHUMAN TRANSFORMATIONS:
#15 THE SHADOW BANDITS
- "Black Ghost"by Toyota Aritsume (Tsune Toyota)
#38 THE ATOMIC GHOST
- "Mysterious Human Ghost" by Kano Ichiro
#43 THE NUCLEAR WITCH
- "The ESP Witch" by Kazumasa Hirai
#46 THE MONSTER BIRD
- "Sky Majin" by Kano Ichiro
#50 THE LIVING STATUE
- "Mysterious Image Giant" by Kano Ichiro
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