Noah secret is revel in this episode
This episode is similar to Stranded from Teent titans series. As both episodes consists in that the protagonists are trapped in a dangerous place with some monsters lurking and stalking them. And one of the characters (Rex / Starfire) lost their powers during most of this situation as result of an emotional conflict caused by their friends (Noah confessed by a spy of White Knight / Starfire misunderstood the commentary of Robin about that she isn't his girlfriend), and they only retrieves their powers in the final parts of this ordeal after settled everything with Noah and Robin.