Collects Immortal Thor #11-15. Continuing a truly epic Asgardian saga worthy of the IMMORTAL name! Tyr has vanished, and there are whispers of cosmic forces at work. And so the children of Odin gather in their father's name to search for one of their own. Regal Thor, fierce Angela, brave Balder, swift Hermod, quiet Honir, strong Vidar, cunning Loki, even Laussa the youngest - all are there...and another beside. One whose name they fear. This is the story of the Immortal Thor...and the lost son of Odin! Then, Hercules returns to the world of Thor, seeking the Thunder God's aid in solving a mystery - but their search leaves them trapped in a realm of endless night! A great danger is caged in this dark realm: Zeus, King of the Greek Gods! When thunder meets lightning, will either survive? Meanwhile, in the sunshine of Asgard, the Enchantress waits to discuss what Thor owes her.