Chrono Wiki
Chrono Wiki

Robo (ロボ "Robo"?) is a robot originally created to assist humans at the Proto Dome in Chrono Trigger. His real name is Prometheus (プロメテス "Purometesu"?) while his serial number is R-66Y. He uses his robotic arm as a weapon and although Spekkio cannot grant him the power to use magic (Spekkio being unable to properly read his character), Robo can use laser attacks that are similar to Shadow magic and bomb attacks that are similar to Fire magic. He also sports several healing techs. Along with his sturdy physique and high physical damage capabilities, he is the most versatile character in Chrono Trigger.

"Although I have no emotions, there is something warm and cozy about this letter."
— Robo, commenting on the letter left on the Rainbow Shell by Queen Leene.

Physical Appearance

Rotund and bulky, there is no doubt Robo packs a punch. Unlike the other R-Series robots similar in construction to him, which were recolored blue while Atropos XR was recolored pink, Robo is beige and brown. The color of his metal skin is presumably the result of the weather in 2300 AD, which appears to be severely polluted. The color may also be an attempt on the part of the game designers to highlight the dissonance between Robo and the other robots of this time era. His outer body equates to an exoskeleton of metal plates that splay or separate under duress or emotional excitement. Underneath, there is a soft layer of what appears to be black rubber

Robo is quite bipedal with two claw-like feet and two arms, one serving as a three-fingered hand and the other as a laser cannon or spring-loaded fist. Robo also has green eyes. Vents serve as the Robot's mouth and nostrils.

Robo is decidedly male. The other robots refer to him as such, and his romance with Atropos XR also alludes to the robot's gender. On his back, Robo wears what appears to be some sort kind of cooling gear, indicated by the smoke-spewing chimney that branches from it.


Robo is shown to be very curious. Unable to comprehend human emotions at first, he analyzes and studies humans, taking them to be a very interesting, very puzzling race. He is friendly towards humans and refrains from the brutal force of killing and slaughtering the humans, unlike multiple robots in the Geno Dome.


Having a curious and bright personality, he was rendered dormant by the Apocalypse in the year 1999 AD, but is found and repaired by Lucca in the year 2300 AD. Upon his reactivation, Robo has no memory of his prior mission and joins the party. Alongside Crono, Robo assists in shutting down the power in Derelict Factory, which controls the power of the nearby domes, and thus permits access to a time Gate back to the Present. Within the Factory, Robo shares a not-so-warm reunion with the R-Series, his former comrades and mechanical brothers. Their combined effort damages Robo severely, but Crono and his friends succeed in preventing the R-Series Robots from causing permanent damage.

Entering the Time Gate with his companions, he accidentally ends up at the End of Time where Gaspar explains only three beings can travel through a Gate simultaneously to avoid ending up there.

After the resurrection of Crono atop Death Peak, Robo learns that he originated from Geno Dome, a robot-producing Factory east of the Derelict Factory and isolated on an island. There, he is punished by his corrupted maker, Mother Brain, for having sympathy for humans, and he meets his long-lost companion robot Atropos XR. For the first time since Lucca reactivated him, he remembers his true function was to survey and service humans and prevent Mother Brain from spreading her poisonous tyranny to the other robots.

In the Middle Ages, Robo volunteers to spend four hundred years restoring Fiona's Forest. During this time, Robo ponders the existence of an Entity, a being who seemingly guided Crono and his friends through time the intended purpose of intervening in affairs the Entity grieves. He explains his theory to the party when reunited outside the Forest Shrine in 1000 AD.

After defeating Lavos, Crono's companions return to their own time periods. Lucca and Robo share a touching final farewell, the latter explaining that Lucca had shown him the meaning of human emotion. Thereafter, he procrastinates entering the Gate back to the Future, fearing that because he toyed with time, so to speak, he would cease to exist in his original time period. However, in the most common ending of Chrono Trigger, Robo still exists in the new timeline and as the Epoch is searching for Crono's mother, he and Atropos XR are seen overlooking a more beautiful landscape (as Lavos didn't destroy it in 1999 AD).

Chrono Cross

however In Chrono Cross, Robo makes an appearance as the Prometheus Circuit while was terminated by FATE. However, after the ending of Chrono Cross, Chronopolis is most likely never built; and even if it were, Project Kid would not be started, so it is safe to assume that after you beat Chrono Cross, Robo is still alive. Masato Kato has officially gone on record as stating the circuit is Robo. "Anyway, if you have played Trigger, then Prometheus should be very familiar to you. I'm sure a lot of players would make a similar 'big fuss' over the death of such a much-loved friend..."


Robo is a very versatile character, able to take the most damage of any character while being a very strong physical attacker. He possesses a wide variety of single, dual, and triple techs, which inflict damage and heal other party members. His main downside is his slow speed, which can be remedied through Speed Capsules or Atropos XR's ribbon, as well as low magic, which can also be similarly remedied with Magic Capsules.

Robo has no Magical element, so he has no resistance.

Single Techs

Tech (SNES/PS1 Name) Japanese Name MP TP Target Description
Rocket Punch ロケットパンチ 1 N/A One enemy Launch fist at an enemy.
Cure Beam ケアルビーム 2 N/A One ally Restore a small amount of HP to an ally.
Laser Spin 回転レーザー 3 5 All enemies Attack all enemies with laser. (Shadow)
Robo Tackle ロボタックル 4 150 One enemy Charge and attack an enemy.
Heal Beam ヒールビーム 3 400 All allies Restore a small amount of HP to all allies.
Rapid-fire Fist (Uzzi Punch) マシンガンパンチ 12 600 One enemy Barrage an enemy with rocket punches.
Proximity Bomb (Area Bomb) サークルボム 14 800 Enemies close to Robo Blast surrounding enemies. (Fire)
Electrocute (Shock) エレキアタック 17 1,000 All enemies Zap all enemies with electricity. (Light)

Triple Techs

  • Lifeline - This triple tech gives the party an automatic revive if any party members are defeated mid-battle. It requires Robo to know Laser Spin, Crono to know Cyclone and Marle to know Arise








  • As with Atropos XR, his robotic lover, Robo was named after a figure in Greek Mythology. Renowned for his mischievous intelligence, Prometheus stole fire from Zeus and provided it to early humans. Prometheus is often blamed, in ancient sources, for his pivotal role in history. Likely, Robo was given this extra name to explicate his role as a time-traveler and his outright defiance of Mother Brain for sympathizing with the humans.
  • Mary Shelley's Frankenstien is subtitled "The Modern Prometheus". This adds a new dimension to the man-made qualities of Robo and the struggle encountered as he develops a human identity.
  • In the Japanese version, Robo has a unique speech; he speaks with bits of katakana in his sayings and has trouble with pronunciations. Most of the robots talk in all katakana, with the exception of Johnny.
  • In the FMV of the PlayStation and DS releases, Robo is the only playable character without a special ending. This can be attributed to his role as the Prometheus Circuit in Chrono Cross.
  • In Ravenstone Mine, an expansion to the Facebook game Ravenwood Fair, you can buy a "protector" called R-68Y. This is basically a plagiarised Robo.

Musical Theme

Music Title Music Track
Robo's Theme

Site Navigation

Playable characters
Crono · Marle · Lucca · Frog · Robo · Ayla · Magus
Non-playable characters
Lavos · Doan · Old Man · Spekkio · Cyrus · Masa & Mune · Doreen · Melchior · Alfador · Belthasar · Queen Zeal · Schala ·

Queen Leene |King Guardia XXI · King Guardia XXXIII · Chancellor · Master of Kitchens · Commander · Fiona · Ozzie · Flea · Slash · Ozzie VIII · Toma Levine · Azala · Marco · Fritz · Elaine · Dalton · Queen Aliza · Toma XIII · Johnny

Time Eras and locations
65 000 000 B.C.
Mystic Mountains · Forest Maze · Ioka Village (Trading Hut) · Laruba Ruins · Dactyl Nest · Reptite Lair · Hunting Grounds · Tyranno Lair · Sun Temple
12000 B.C.
Zeal · Enhasa · Kajar · Blackbird · Zeal Palace · Algetty · Mountain of Woe · Ocean Palace · Black Omen · Sun Shrine · Sun Temple · Last Village · Last Village Commons · North Cape · North Palace · Land Bridge · Skyway
600 A.D.
Truce Canyon · Truce · Guardia Forest · Guardia Castle · Zenan Bridge · Manolia Cathedral · Dorino · Cursed Woods · Fiona's Villa · Denadoro Mountains · Porre · Choras · Elder's House · Sun Temple
1000 A.D.
Leene Square · Lucca's House · Guardia Forest · Guardia Castle · Zenan Bridge · Porre · Truce · Medina Village · Forest Ruins · Heckran Cave · Melchior's Cabin · Choras · Crono's House · Mayor's Manor · Sun Temple · Fiona's Forest · Fiona's Shrine
1999 A.D.
Arris Dome
2300 A.D.
Arris Dome · Proto Dome · Site 16 · Site 32 · Keeper's Dome ·

Trann Dome · Bangor Dome · Geno Dome · Derelict Factory · Sun Shrine · Sun Temple · Death Peak

End of Time
Arena of the Ages
Tech · Magic · Save Point · Epoch · Apocalypse · Masamune · Chrono Trigger
Enemies · Weapons · Items · Accessories · Armor · Key Items · Headgear
Playable characters
Serge · Lynx · Kid · Poshul · Leena · Macha · Korcha · See more...
Non-playable characters
Ash · Belcha · Belthasar · Chief Direa · Dario · Doreen · Dragon God · Dwarf Chieftain · Entity · FATE · Fortune Teller · Garai · Ghetz · Ghost Children · Gogh · Kiki · Lisa · Lucca · Marge · Masa & Mune · Mermaid · Old Fisherman · Poet · Prometheus Circut · Rosetta · Sage of Marbule · Schala · Shaker Brothers · Skelly's Grandmother · Stablekeeper · Statue Cleaner · Tia · Toma XIV · Wazuki · Witch Doctor · Una · Zippa · Zelbess
Another World · Bend of Time · Darkness Beyond Time · Home World
El Nido Archipelago
Arni · Cape Howl · Chronopolis · Dead Sea · Death's Door · Divine Dragon Falls · Dragon King Palace · Earth Dragon Isle · El Nido Triangle · Fossil Valley · Forbidden Island · Fort Dragonia · Gaea's Navel · Grand Slam · Guldove · Hermit's Hideaway · Hydra Marshes · Isle of the Damned · Lizard Rock · Lucca's House · Marbule · Mount Pyre · Nadia's Bell · Opassa Beach · Pearly Gates · Porre · S.S. Invincible · S.S. Zelbess · Sea of Eden · Shadow Forest · Sky Dragon Isle · Smithy · Temporal Vortex · Termina · Terra Tower · Viper Manor · Viper Manor Bluffs · Water Dragon Isle
Key Terms
Tech · Element · Innate · Record of Fate · Demi-human · Acacia Dragoons · Time Egg · Frozen Flame
Enemies · Weapons · Elements · Items