Halo Infinite: How the Flood may return
(Windows Phone Central)

The chances a Flood outbreak could occur on Zeta Halo are uncomfortably high. The Flood, which was once one of the two main antagonists of the Halo series as a whole, have not had much of a presence in the franchise since their defeat at the end of 2007`s Halo 3. They briefly threatened to return in full during the events of Halo Wars 2`s Awakening the Nightmare DLC, but Banished forces managed to stop the outbreak before it got out of control. Since then, many have wondered when — or if — the Flood will appear once again. Warning: Spoilers for Halo Infinite`s campaign follow, so proceed with caution! A secret easter egg in Halo Infinite may hint at the answer. While the terrifying parasite didn`t directly appear in the Halo Infinite campaign, players did notice that in the game`s second level, Foundation, a Forerunner cylix labelled with a Flood Infection Form symbol could be found in a secret room (thanks, HiddenXperia). You can reach the room yourself by going down the hall...