Interdisciplinary Microplastic Sciences (InterMicro) is a PhD programme at the University of Bayreuth that emerged from the Collaborative Research Centre 1357, Microplastics. It brings together chemistry, physics, engineering, geosciences, mathematics and biology to understand plastics from macromolecules to their impacts in the environment. By combining laboratory, modelling and field research with training in communication and sustainability, InterMicro prepares early-career researchers to develop science-based solutions for microplastic pollution and global environmental change.