Marvel’s Agents of SHIELD returns from winter break Tuesday with a new episode called “Broken Promises” and kicks off the next big arc subtitled “L.M.D.” With the Ghost Rider arc completed (or at least brought to somewhat of a conclusion for now), Aida will step up as the new main threat of the show. Warning: this article contains full spoilers for Marvel’s Agents of SHIELD! To recap, the last episode ended with the revelation that May has been replaced with an L.