Ultraman Mebius S1 E21 - A Call From Void Ultraman Mebius

GUYS discover a distress signal from the spaceship Arandas and head to the unknown Ultra Zone region to investigate. They find the remains of the Arandas and a graveyard of banished monsters! Mirai then begins to tell the tale of how Arandas befell its fate, a story that nobody alive should know...