Date Time Connecting smallest and largest scales Cosmic particle accelerators like blazars (artist’s impression) are typical objects for multi-messenger astronomy (Image credit: DESY, Science Communication Lab) Established in 2019 with its central hub at CERN, the European Consortium for Astroparticle Theory (EuCAPT) aims to bring together the European community of theoretical astroparticle physicists and cosmologists to tackle some of the greatest mysteries in science. There are strong hints that explanations for dark matter and dark energy, the origin of high-energy cosmic rays, the matter-antimatter asymmetry, and other enigmas about the universe at large lie in the domain of particle physics. Addressing them therefore demands a highly interdisciplinary approach by a strong and diverse community.