Batman and Robin Eternal was written by James Tynion IV, Scott Snyder, Tim Seeley, Steve Orlando, Genevieve Valentine, Jackson Lanzing, Collin Kelly, and Ed Brisson.
The series switches between the present, where Dick Grayson and his allies battle the plans of the mysterious Mother, and the past, where Batman and Robin face the Scarecrow for the first time.
Running away, he meets a nearly silent young woman who also says one word - "Mother", but instead of attempting to kill him, she deliberately holds back and gives him a Bat-flashdrive containing a confession from Batman, as well as a list of names.
They save Bruce from dozens of ax-wielding assassins, and Dick follows a lead while Tim, Jason, and Stephanie deal with the disappearance of an injured Harper and the mysterious Cassandra.
Jason and Tim follow the electronic signal that coincided with the attack on Bruce and find Bane attempting to take back his former country from the mysterious Order of St. Dumas.
Using these powers, the Sculptor shows Harper Cassandra's training, deprived of language so that she must read movement and body cues, and forced to kill a woman in a dark alley.
Inspired by her meeting with Batman, Cassandra paints the Bat on her face with blood as a mask, and together, Dick, Harper, and Cass fight their way defeat David Cain and barely escaped from the nuclear self destruction of the base and on to Spyral's headquarters to plan their next moves.
David Cain escapes after incapacitating Harper Row and Jason Todd, and Project Ichthys activates which causes Tim Drake and Cassandra to attack Dick Grayson and Helena.
Dick Grayson and Helena manage to free Tim Drake and Cassandra by making them exposed to Scarecrow's gas and they go find Harper Row and Jason Todd.
While on the plane, the Robins start to lose hope on finding Mother but Damian Wayne tells them that Batman is proud of all of them in their own way, which motivates them enough for Dick Grayson to create a plan.
Batman allows Cassandra Cain to join him, and he reconciles with Nightwing over the recent events before heading off with Tim Drake, Damian Wayne, and Jason Todd to stop a heist.
After a failed attempt to stop Scarecrow's plane, Bruce discovers the existence of a woman known as Mother from a fellow society member, who tells him he purchased his wife made to order by this human trafficker.
In his ambition, Scarecrow reveals that Mother plans to gas every major city in the world with his newly created "trauma toxin", leaving billions of children ripe for her new process of brainwashing and manipulation.
Cassandra Cain returned to mainstream continuity in Batman and Robin Eternal, and serves as one of three main characters alongside Dick Grayson and Harper Row (Bluebird).