The spotlight turns to Robin, who must leave his teammates to fight alongside his crimefighting mentor, Batman. And the stakes couldn't be higher for the Dynamic Duo as they face off against the Demon's Head himself: Ra's al Ghul!
Batman and Robin fight their way through soldiers of the League of Shadows to a rocket on the launch pad. Robin keeps them occupied while Batman makes his way to the rocket. Ubu intervenes, and with his superior strength, manages to pin down Batman against a tanker truck. Robin saves his mentor by whirling a fuel hose around Ubu's ankle and jamming the gas pedal. Ubu is pulled away. Batman makes his way to the foot of the rocket, where Talia is waiting for him.
At mission control, Carol and Tom notice the commotion. Carol asks Tom to shut down the countdown, but he can't—the systems are hacked, and he is locked out. Carol realizes the rocket's original payload, ozone layer measuring equipment, has been replaced by the villains.
Robin contacts the Batcave, where Alfred is monitoring them via a camera in Batman's cowl. Talia threatens Batman, as she does not want a confrontation between him and her father—the only two men on the planet she loves. Batman quips that she would have to shoot him to accomplish that. Talia lowers her gun; Alfred warns Batman that he'd better not be smiling, but he is.
Batman makes his way to the rocket's nosecone, and discovers its new payload—a diamond lens. As Batman figures out how to destroy it, Ra's al Ghul himself arrives. Ra's explains his plan: with the lens, he could focus the sun's rays into a beam that could destroy cities. The human surplus would be destroyed, while nature and rural areas would remain. He offers to spare Gotham City, if Batman joins his cause. Batman passes.
Ra's is not pleased, and boasts that in the past, he has been defeated because he underestimated Batman. He triggers the rocket with a remote detonation, but Batman tells him he might not have underestimated him, but he has underestimated Robin. While Batman and Ra's spoke, Robin had snuck up and removed the lens. Ra's lunges at him, but the lens falls, and Ra's with it. He lands on the launch pad near Talia. Though the mission is a success, Batman is sure Talia will hate him for her father's death. Alfred comforts him that Ra's' deaths tend to be temporary anyway.
Ubu and Talia pick up Ra's' body and leave the facility. Alfred patches a communication from Red Tornado through, about the passing of Kent Nelson.
Talia and Ubu reconvene with Sensei at the Lazarus Pit of Infinity Island. He is revived, but out of his senses. As Ubu steps forward to help his master, he is knocked down. Ra's apologizes, but Ubu needs none from his master. His first act back alive is to order Sensei to prepare "The Serpent", but not activate it yet. Talia protests, but to no avail. As Ra's and Ubu go off, Talia blames this behavior on the pit, but Sensei tells her he has always been this adamantine. As they walk away from the pit as well, they are disturbed by a scream from the pit. A clay figure emerges, calling out Talia's name. Sensei blames Talia for it.