In Locke & Key Season 1 Episode 9, Ellie let Kinsey and Tyler into her head, and in Locke & Key Season 1 Episode 10, the Lockes standoff against Dodge and her shadows.
In the previous episodes of Netflix’s Locke & Key, Sam broke into Keyhouse to get the Head Key for Dodge, who was actually Lucas.
Ellie eventually decided to use the Head Key to show Kinsey and Tyler the truth while Rufus and Bode stayed behind.
Meanwhile, Dodge used the Identity Key to be Gabe, as he’d also been Dodge all along.