A wharf roach mutated to gigantic size by exposure to Godzilla's radiation, Shockirus leapt from the monster's body when he appeared at Daikoku Island and onto the Yahata Maru No. 5, where it killed all but one of the crewmembers by draining their bodily fluids. When news reporter Goro Maki came aboard the derelict ship, Shockirus attacked him and nearly killed him before the sole survivor, Hiroshi Okumura, killed it with a hatchet.
Shockirus' name is never spoken in The Return of Godzilla, nor did it appear in the film's theater program. It is only ever referred to as a "wharf roach monster" (フナムシの化け物 or "giant wharf roach" funamushi no bakemono) (巨大なフナムシ. The name "Shockirus" did not begin to appear until later official publications. While the creature is identified as a kyodaina funamushi)wharf roach - a species of isopod related to similar species such as the giant isopod and woodlice - in the Japanese version, the film's international English dub refers to it as a sea louse - a type of copepod - instead; this is reflected in some Japanese sources such as Godzilla 1954-1999 Super Complete Works, which give it the English name Giant Sea Louse. This change may have been due to the fact that real wharf roaches are not parasitic and feed on algae and detritus rather than blood, whereas sea lice are known to parasitize fish.
Shockirus was inspired by a giant flea featured in the unproduced 1955 screenplay Bride of Godzilla?. In the unmade film, they existed as part of a hollow Earth ecosystem as gigantic parasites to the Godzilla and Anguirus species before spilling onto the surface when a mining company opened up a shaft into their domain. The giant fleas caused several deaths and led to the discovery of the hollow Earth system. Tomoyuki Tanaka asked writer Hideichi Nagahara to revise Bride of Godzilla? in 1978.
Across several drafts the exact look and location of the parasites changed, becoming instead residents of a hollow island before being changed to mutated lifeforms created by feeding on Godzilla's irradiated blood. The concept of a parasite mutated to giant size by feeding on Godzilla was carried over into Tanaka's 1980 Resurrection of Godzilla proposal and its 1983 revision. These two proposals eventually culminated in The Return of Godzilla, which featured Shockirus. Several sequences were planned for the giant wharf roach, including multiple Shockirus invading a village after jumping off from Godzilla's body, but these were cut for time. These scenes survive in the film's tie-in novelization.
While officially a mutated wharf roach, Shockirus resembles other marine arthropods like the horseshoe crab with its multiple legs and hard shell. Its shell has many bumps, and it has a two-pronged spiked tail.
When Godzilla attacked the Yahata Maru No. 5, Shockirus jumped off of his body and came aboard the boat. Shockirus hunted down the crew members that had survived Godzilla's attack and killed them all, draining their bodily fluids and leaving behind desiccated husks. The last survivor, Hiroshi Okumura, was injured by Shockirus and locked himself inside a locker to hide from the creature. When reporter Goro Maki came aboard the ship the next day, he was attacked by Shockirus, who jumped onto his chest and crawled toward his throat. Fortunately, Okumura regained consciousness and stabbed Shockirus in the back with a hatchet, killing it. After Okumura reported his experience to Professor Makoto Hayashida, the scientist hypothesized that Shockirus was parasitizing Godzilla and had been mutated to its monstrous size due to prolonged exposure to his radiation.
Shockirus is an extraordinary jumper.
Shockirus can suck vital fluids out of a host.
Shockirus' hard carapace provides it some degree of protection.
- Multiplayer Adventure: New Godzilla (1985) - NEC PC-8801
Shockirus in Multiplayer Adventure: New Godzilla
A Shockirus appeared to attack Kino and Take when they climbed up Godzilla's body.
Several sea creatures resembling Shockirus appeared very briefly on page 4.
Shockirus in the Godzilla manga
- Main article: Shockirus/Gallery.
Shockirus' roars are Ebirah and Kumonga roars that have been raised or lowered in pitch and sped up or slowed down, respectively. In Godzilla 1985, the roars are replaced with a different hissing screech.
- Shockirus was the first new monster introduced in the Heisei series.
- In the BBFC's review of The Return of Godzilla for release in the United Kingdom, Shockirus was described as a "giant seahorse." Seventeen seconds of footage was cut from the sequence it appears in for the film to receive a PG rating.
- Shockirus is referenced in the Godzilla Singular Point episode "Graftage," when members of the Otaki Factory investigate a Manda carcass which has washed ashore. Haberu Kato suggests that the kaiju may have been killed by "gigantic sea roaches."
This is a list of references for Shockirus. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: 
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