A rogue vampire working as a mercenary stumbles into the hands of SHIELD and The Avengers.
They're not quite sure what to do with her, given she's previously been allied with The Mad Titan Thanos.
Echo has escaped from her prison and is being hunted down by the captors who endlessly tortured her to near insanity. When she meets a dark alien prince and is forced to fight, she's not sure if she can control the incredible abilities that have burdened her since birth. And things get even more complicated when she discovers she has feelings for him.