Episode 4 of Super Space Sheriff Gavan Infinity, titled “Underground Fortress,” is a high-octane installment that masterfully expands the series’ multiverse lore while maintaining the classic Metal Hero spirit. The episode centers on MultiEarth Σ3302, where Reiji investigates a series of vanishing facilities alongside the Galaxy Federal Police duo, Mikuro Arimoto and Shoko Hamura. This setting provides …