Ollie remembers what happened on the last day he saw his best friend. Will he find his way home to Billy – or is he too late?
The friends’ quest takes a heavy turn as a heartbreaking flashback reveals how Zozo met Nina, then lost her. But a happy memory sparks much-needed hope.
While floating down the Dark River, Ollie, Zozo and Rosy search for the next spot on Ollie’s map. Ollie recalls something important about Momma.
Supergirl realizes that in order to stop Lex and Leviathan she must work with the one person she never thought she’d trust again – Lena. Nia keeps dreaming about Brainy…