Now back from hiatus, Supergirl’s third season is really hitting its stride as Kara races to stop three world killers.

Also hailing from Kara’s native Krypton, Reign, Purity and Pestilence have come to earth to destroy all life so the planet can be “reborn.” Supergirl has to stop them before they can cause more destruction in her own time, as well as the future, where we now know that Pestilence causes the blight that killed so many in the 31st century, including Imra’s sister.

Even worse, the world killers are beyond powerful, with Reign alone besting Supergirl during the first half of the season. Now that the three are united, they’ll be even stronger. We still don’t know exactly who created them and why, although it does seem to tie into an ancient Kryptonian religion. Where are those responsible for creating the world killers, and what else might they throw at Supergirl?

Supergirl now knows the true identities of the women that the world killers Reign, Purity, and Pestilence possess, as well as the fact that Lena knew Sam was Reign and kept it from her. Kara and her team at the DEO have to set aside their differences with Lena Luthor and The Legion so they can all work together to figure out how to stop the world killers.