WELCOME, Thetis

Reploids can not dream, but Professor Gaudile did. He had a dream about a young Reploid boy swimming in the oceans were Giga City once laid. Worried and struck with inspiration, the professor set out to create such a Reploid and named him Thetis.

Now Thetis has a dream.

With the help of Marino and Cinnamon (now renamed Minas), Thetis sets to clean the oceans where Giga City was laid. A rather rough project at first, but with the aid of a certain Biometal, Thetis believes that he can clean the oceans so those that belong in water will return. However, a certain Reaper and Witch are looking for the stolen Biometal. Will they stop Thetis from completing his mission, or will the young Reploid be able to achieve his dream?