Mia is Missing! is a Normal Mission in Xenoblade Chronicles X. It can be received from Mia in the Ganglion Antropolis in Cauldros. Near the back of the Antropolis, hanging a left down a side passageway will lead to the trailer that Mia is locked in. Said trailer is marked with a yellow square and a white dot on the map. The trailer is guarded by a high level Definian Clone. A cutscene will trigger upon approaching it.
- "Search for a blue-suited xenoform in Cauldros's Ganglion Antropolis."
- "Acquire the container key from HH100: Hierana in Cauldros's Ganglion Antropolis."
- "Talk to Mia in Cauldros's Ganglion Antropolis."
- "Talk to Walter at the maintenance center in the Administrative District."