Agents of SHIELD has been quietly beavering away in the background, churning out solid episodes that have enjoyed firm success with fans and newcomers alike. Tonight's episode sees an explanation as to why Agent Coulson has been scribbling those weird alien glyphs everywhere. This, of course, is because dead bodies are turning up with the same glyphs. Is Coulson the murderer? Is it something to do with cosmic forces? Or is it another HYDRA plot? And when are we going to see any of the actual Marvel stars turn up? When's that happening, huh?!