W2W2nite 2/12/20: Crunchyroll
One day, a gate to another world opened in Mikado City. Invaders from another dimension, referred to thereafter as Neighbors, overran the area around the gate, leaving the city gripped by fear. However, a mysterious group suddenly appeared and repelled the Neighbors. This Border Defense Agency independently researches Neighbor technology and fights to protect this world. In a short time, they managed to build an enormous base and prepare a defensive system against the Neighbors. it’s been four years since then.
All episodes dubbed for English except for 1-48 and 64-73.
"There are also other characters that come and go (also owned by the Warner Bros. Discovery conglomerate media company)."
Huh. Is that just referring to other characters from the show itself, or is this implying that the new season is going to have cameos from other WBD IPs