Godzilla: King of the Monsters confirms that a classic location from Toho's movies - Infant Island - is somewhere in Legendary's MonsterVerse. Infant Island is a place that's been associated with Mothra since the early 1960s.
Mothra was one of the three Titans to appear alongside Godzilla in the third MonsterVerse installment. The peaceful Titan took Godzilla's side in the final battle with the movie's main antagonist, Ghidorah. While the movie put the Twin Fairies. It was established in the original Mothra that two tiny, mystical women share a deep psychic connection to Mothra and travel with her everywhere. King of the Monsters reimagined the Fairies by having Zhang Ziyi's characters play twin sisters whose family has been involved with Monarch and the Titans for several generations.
During the scene where Zhang's primary character in the film, Dr. Chen, explains her family's history, a photo shows two of her relatives kneeling down at an archeological site. The picture is labeled "Infant Island, 1961". Not only is this is an Easter egg to 1961's Mothra, it's also confirmation that Mothra's home exists in the MonsterVerse. Infant Island is one of Toho's most important original locations. It precedes Godzilla's home, Godzilla vs. King Ghidorah.
This place was first shown in Mothra when scientists traveled there and came across the creature, the Twin Fairies, and a tribe that worshiped her. It was learned in the movie that Mothra is Infant Island's self-appointed guardian. Since the MonsterVerse's Mothra still has her Twin Fairies, it stands to reason that her connection to Infant Island is present as well. If she's its guardian, that could be why Dr. Chen's relatives were there in the first place.
There's a chance that Infant Island could be more than just an Easter egg in future MonsterVerse movies. The Mothra may return sooner rather than later.
