[5][6] At the headquarters of the League of Assassins, Ra's al Ghul grooms Damian Wayne, the young son of his daughter Talia and Batman, to succeed him.

The League is ambushed by a group of assassins led by Slade Wilson, Ra's al Ghul's initial choice for successor before Damian's birth.

After the incident, Talia takes Damian to Gotham City to meet his father and remain in his care while she and the League deal with Slade.

When Damian becomes violently impatient and inadvertently alerts the enemy to their arrival, the group is confronted by a swarm of Man-Bats, which Langstrom explains is part of Deathstroke's plan to create superhuman flying assassins.

[8] IGN gave the film a rating of 7.5 out of 10, saying that "Son of Batman finds the humor amidst the more adult-oriented action elements in this latest DC animated adventure".

[12] Tommy Cook for Collider.com also gave the film a negative review: "Striving for the dark edge of what I guess people expect from a Batman movie while still maintaining that Saturday morning toon sheen, the film feels mass produced to appeal to all (give the adults – gore; the kids – a spunky child sidekick); however in the effort to appease everyone, SoB in fact caters to none".