The Lock-In begins in earnest as Jentry announces she is moving back to Seoul with Moonie, unaware that Mog-Moonie is letting in the underworld's guardians. Gugu quickly travels to the school as it is transported to the underworld.
Lock-In (Jentry Chau vs. The Underworld episode)
2020s
for 2020s in TV Episodes By Decade
Suggested by hitojaf564
Yes cartoons count.
