Sol 87 (2017)

On year 2094, Commander James is on mission above Mars' Surface to scanning it to make a complete map of the planet. One of his two robots, D.O.R. (Discovery Optical Relay), makes a lonely journey to explore a distant mountains when it detects a strange movement of stones from the top. After D.O.R. turns off mysteriously, Commander James and the other rover R.E.X. (Relations Experiment Explorer) goes to the place where D.O.R.'s signal gave its last location. After to finding D.O.R. totally destroyed, Commander James actives his video feed to discover what D.O.R. saw just before to be destroyed, but in this moment and unknown for him, R.E.X. detects movement on a close cavern and it enters to investigate.