Green Arrow's niece, Artemis, joins Young Justice and must save a bright young scientist from the League of Shadows.

Brion Markov is determined to rescue his missing sister – even if it means throwing down against the entire League of Shadows.

Just as multiple Shadows fall across her path, Artemis Crock’s life is interrupted by devastating news.

For Tigress, saving everyone may not be an option - unless help is offered from an unexpected source.