A young Inkling meets Cap'n Cuttlefish after entering Octo Valley through a manhole in Inkopolis.
Cap'nCuttlefish had set up a base of operations at the edge of Octo Valley to keep an eye on the Octarians. He recruits the young Inkling as Agent 3 of the New Squidbeak Splatoon to rescue the missing Zapfish.
Agent 3 succeeds in their mission and returns all of the kidnapped Zapfish to Inkopolis.
Agent 3 confronts DJ Octavio, the leader of the Octarian army. After a fierce battle where Agent 3 is aided by the Squid Sisters, Agent 3 emerges the victor. Calamari Inkantation was played during the battle, and it affects many of the Octarians—including Marina, who was a part of the Octarian army at the time, and another Octoling, who would later become Agent 8.
Thanks to Agent 3, the Great Zapfish is returned to the city of Inkopolis. The city's peace is restored without any fanfare.