We already have three kaijus set to appear in Legendary’s Godzilla sequel, Godzilla: King of Monsters but it looks like there might be a reference to a fourth monster, in the form of Destroyah.

In the 41st day of production for ‘King of Monsters’, director Michael Dougherty went to Twitter to share a rather shady reference to the Big G’s past.

If you don’t know what this is, don’t worry you are not alone.

The photo shared by Dougherty is called the “O2 Destroyer”. It’s pretty much a bomb that kills oxygen in the area where it blows up. Nothing survives this, except for Godzilla that is.

Here’s one of the fights between Godzilla and Destroyah from the old movies from Japan.

The film will feature Godzilla together with three kaijus already teased in the after-credits scene of Kong: Skull Island. They are Mothra, Rodan and King Ghidorah. Godzilla: King of the Monsters has a March 22, 2019 release directed by Michael Dougherty starring Vera Farmiga, Charles Dance, KyleChandler, Bradley Whitford, Thomas Middleditch, Sally Hawkins, O’Shea Jackson Jr., Ziyi Zhang, Ken Watanabe and Millie Bobby Brown.