In the year 0087 of the Universal Century, as the conflict between the AEUG and the Titans intensified, Anaheim Corporation successfully developed the MSN-003 Nemo, a mobile suit with excellent performance and manufacturability as the AEUG's main mobile suit. However, the emergence of the Titans' powerful transforming mobile suits made the AEUG struggle, and they implemented the "Nemo Strengthening Plan" to strengthen their fighting power. As a result of exploring various variations, they rolled out the MSA-003-SK Nemo Stark, a general-purpose reinforced prototype that stood out from mass-produced models.

The Titans hold real power in the Federal Congress, and Brigadier General Brex Fora, the AEUG's representative,

HGUC General-Purpose Enhanced Prototype Nemo Stark | モトッチ's Gunpla works