X-Boom, real name GB-6000, is an Advanced Sound Device (ASD) that comes from the Universe of Sound and helps Helena (the mysterious girl) in her quest to find Boom. Compared to Boom, X-Boom is a more advanced model, capable of preparing quantum tunnel vectors, crossing contiguous universes and providing medical relief. She's also capable to analyse large quantities of data and carry out analyses on various living species (including humans). In the first few episodes she's mistaken for Boom by Alex and the other guys of the company. She's responsible for the classification of subjects most suitable to carry out missions with high level of empathy and cortical synchrony. In the last episodes of the series we will also discover an important secret about her...