Season 1, Episode 19 - House of Time/House of Aliens
The contest for School Representative heats up, with Mara running. Jerome asks Mara out, but gets rejected when he starts insulting Mick. The latest riddle leads Sibuna to the grandfather clock, but when they open it, it is found to be empty, making it seem like someone has already taken the puzzle piece. Alfie is still fishing around so the gang tells him he was right all along about aliens. Then, during a Sibuna meeting, Nina opens the 5th puzzle piece and a secret message appears on the wall of the house itself. Alfie attacks Mrs. Andrews, believing her to be an alien, forcing Fabian and Patricia to tell him the truth about the puzzle pieces and their quest for the treasure and welcome him into Sibuna. Jerome helps Mara with her election campaign but Mick returns and asks Mara about, much to his chagrin. She accepts and they become an official couple. Nina goes to visit Sarah who tells her "you are me." In the attic she finds a picture of Victor, Rufus and Sarah in 1960, and only Sarah has aged.