When Thunder was given time off from his work, he saw it to be the perfect opportunity to visit his family. Thinking about who he should visit he eventually settled on his twin brother, Lightning, since he’s been able to see his parents quite a bit and he’s never been that close to his cousins.

But when he gets there he slowly finds he and his brother have changed quite a bit since the last year they saw each other.

Takes place before season 1.