Super Robot Wars OG: The Inspector Season 1 Episode 13 Exiles from Paradise

Vindel and Lemon's Shadow Mirror forces have been working with Neo-DC. After the sneak attack on Izu, they are stopped by three black mechs. Retzel's Garbine Mk-3 Tronbe, Sanger's Grungust Type-3, and Giliam's Geschpenst Type RV. Giliam attacks their mothership the Ganland to destroy Shadow Mirror's teleporter, System XN. Vindel orders his men to capture Giliam. How are the two connected?