Agent 8 was an Octoling soldier for the Octarian army and had a change of heart when the Calamari Inkantation was etched onto their soul. In Octo Valley, Agent 8 encountered Cap'n Cuttlefish and Agent 3, where Cuttlefish had them attack Agent 8. The two battled until all three of them were attacked by someone and were knocked into the Deepsea Metro. Agent 8 lost their memories from injuries suffered during the fall through the ceiling and became a test subject of the Metro.