Transformers: EarthSpark Episode 21 What Dwells Within Episode Title: What Dwells Within Episode Description: A series of coincidences leaves Robby, Mo and the Terrans trapped underground with the Seekers, though Starscream is constantly irked by their positive view of Megatron at the time when he, Skywarp, Nova Storm, and Soundwave plan their escape. This leads to an encounter with a spacefaring Energon-eating creature called the Dweller.