Marvel's Agents of S.H.I.E.L.D. (2013)

S2E7 The Writing on the Wall

Title: The Messages Left Behind Plot: The team stumbles upon a series of murder victims marked with the same alien symbols that Coulson has been secretly inscribing. As the investigation unfolds, the truth behind Coulson's hidden past and deceptions is brought to light, forcing him to confront the consequences of his actions.