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170,000-Year-Old Cicada Larva (17万年ゼミ幼虫, 17 Man-nen Zemi Yōchū, Viz: 170,000-Year-Old Cicada Nymph) was a Mysterious Being that attacked Z-City at some point during Saitama's training years. It was killed by Saitama.[2]


The Cicada Nymph was a massive cicada-like creature. It had the face of a child at the center of its head.


It was supposed to be a larva underground during the season it popped out.[1]

Appearances in Other Media[]



During Saitama's training years, the Cicada Nymph attacks Z-City and defeats two C-Class heroes, Grad School Graduate and Red Muffler, and the B-Class hero Darkness Blade with ease while the rest of the population barricades itself within Shelter Nr. 7. Sometime later two unnamed A-Class heroes try to fight it, but are also defeated, which causes the Hero Association to declare it as a Demon-level threat and they decide to send one of their newly formed subjugation squads to finish it off. Saitama, while running around in search of a bathroom, runs into the Nymph who suddenly attacks him, but falls victim to Saitama's punch.

Abilities and Powers[]

It defeated two A-Class heroes which prompted the Hero Association to deem it as a threat with a disaster level of Demon.

Physical Abilities[]

170,000-Year-Old Cicada Larva smashing through buildings

Enhanced Strength: The 170,000-Year Cicada Nymph was a powerful Mysterious Being. It had enough strength to defeat multiple heroes, including two A-Class ones.

Enhanced Durability: The 170,000-Year Cicada Nymph was very durable. It was able to smash through buildings without visible damage.

Transformation: It can be inferred from its name that over some period of time, a Cicada Nymph will grow into a 170,000-Year-Old Cicada Adult.


  1. 1.0 1.1 1.2 1.3 One-Punch Man Encyclopedia; One-Punch Man: Hero Encyclopedia, page 183
  2. One-Punch Man Omake; Summer


Mysterious Beings
Dragon (or higher) Boros Orochi *
Demon 170,000-Year-Old Cicada Larva 170,000-Year-Old Cicada Adult Armored GorillaAwakened Cockroach Baquma Beast King Bruinado Bug God Building Booper Deep Sea King Demonic Fan Devil Long Hair *Do-S *Eyesight Face Ripper Fist Fight Djinn Free Hugger G4 G5 Game-Berus Giant Crow Grizzly Nyah Hundred-Eyes Octopus Jumping Spider Macho Daikon Mosquito Girl Rafflesidon Rhino Wrestler Royal Ripper Scaledon Senior Centipede Showerhead Sky King Subterranean King Super Mouse Surprise-Attack Plum The Great Food Tub The Three Crows Unihorn Vampire (Pureblood) 
Wolf Himawari Hotdog Messenger of the Seafolk Piggy Bancon Tongue Stretcher
Less than Wolf
Unknown Alien Seer *Ancient King Angry Grandpa Autumn Phantom Red Golden-ringed Dragonfly *Benpatsu *Choze DarkDark Matter Gunner Eagle Enamel Evil Eggs Evil Eye Evil Natural Water *Falcon Fish of DarknessGale Giant Salamander Gigakigan Goddess Glasses Gyoffrey Hamukichi *Haragiri Hawk Hellfire Junior Centipede Kite Lord Great White ManakoMen's Esthetician Man *Platinum Sperm Rosie Raptora *RepteraSage Centipede Suppon Sword Devil Executioner Venus Mantrap Volten *