Muthr or Multi-Utility Task Help Robot 06 is the robotic caretaker of Eva Nine, as well as the resident unit of Sanctuary 573. Muthr plays a major role in The Search for WondLa, and explores the surface of Orbona with her daughter, Eva Nine.
Muthr helped teach Eva the skills of preparing to leave the underground Sanctuary. When Eva is left alone in her bedroom, Muthr returns to her quarters (The Control Room) to look over and examine the building. When she was alerted that an intruder had entered the Sanctuary, she
set out to find Eva, who returned from her hiding place in a corridor connecting two Sanctuaries. She brought Eva into the Kitchen, where she explained to Eva that she must flee the Sanctuary.
Eva and Muthr heard numerous messages regarding detected smoke in the Sanctuary. Muthr opened a hatch and ushered Eva to climb into it, but Eva refused to do so without her. She eventually got Eva to leave, however, when the intruder blast open the Kitchen door. Inadvertently, Muthr had caught fire and evaded the intruder. She ran into the gymnasium and jumped into a pool in order to put it out. The intruder then found Muthr and disabled her by stealing her battery.
Muthr is found in the Sanctuary by Eva and her newest friend, Rovender Kitt. She is taken into the Generator Room where she is turned on. Muthr awakens in a new crab-like body. Eva told Muthr that she rescued her in order to pursue her quest onto going to the next Sanctuary, Settlement 51. Muthr explains to Eva she cannot leave the Sanctuary due to her duty.
Eva logs in as an official to the Sanctuary mainbase and asks the Sanctuary to identify if Muthr is allowed to leave. The Sanctuary replies positively, just as Besteel returns to the Sanctuary in pursuit of Eva. Muthr, Rovender, and Eva escape the Sanctuary heading to a nearby abandoned Sanctuary, where Eva and Muthr find out they are on a planet called Orbona, not Earth.
Eva and Rovender then rest, as Muthr snaps photographs through Identicapture with the Omnipod. They awake and head out to the next Sanctuary though the undeground tunnels. Muthr explains to Eva that she has to take about a month to get to the next Sanctuary. Eva says she wants to head out for WondLa by going to the city of Solas. which Rovender had recommended. She said they must go through Lacus and all the way to Solas by ferry. Muthr finally agreed and set out for Lacus. They had taken a journey through the Wandering Forest, which lead them to the city of Lacus.
Muthr, Eva, and Rovender arive at Lacus, where a kind alien woman name Hostia (a friend of Rovender) invites them to stay at her house while they avoid Besteel. Muthr is referred to as a "toy" by one of Hostia's sons. Later that night, Hostia offers special drinks to the trio, which Muthr refuses due to the fact that she is a robot.
During a trek through the Wastelands, Besteel attacks Muthr, Eva, and Rovender. The huntsman aims his boomrod at Eva, but Muthr leaps in front in order to intercept the blast, which damaged her in the process. After Besteel had been defeated, Eva and Rovender returned to Muthr's ailing body. Muthr had told Eva that she was proud of her before shutting down completely; it is at this point she is pronounced dead.