Siblings of Grayskull

Adora didn't know she had family out there in this vast universe, but with Horde Prime on the horizon and Glimmer captured she doesn't really even have the time to ponder over it, but luckily for her Glimmer meets another prisoner who kind of knows Adora too. her long lost brother, and he isn't doing so well. If they can find each other, can they help each other?