The Girl with All the Ghosts (S01E03)

Gus and Elton encounter Astrid, who urgently seeks their assistance as she's being pursued by spirits. To help her, Gus opts to consult psychic medium Janey Feathers. However, the trio quickly realizes they are up against a much stronger force than anticipated, prompting Gus to undertake his very first exorcism in a desperate bid to confront the supernatural threat.