Following an 8-year cruise involving 9 planetary encounters and 2 years of solar electric propulsion thrusting, the joint ESA/JAXA mission BepiColombo arrived at Mercury in late 2026. After the completion of a complex sequence of separations and manoeuvres to deliver two orbiters into their respective science orbits about planet Mercury, April 2027 sees the beginning of the mission’s science phase. The data returned from the two Mercury orbiters - the Mercury Planetary Orbiter, and the Mercury Magnetospheric Orbiter, MMO, also known as Mio, are expected to allow major advancements in our understanding of the nearest planet to the Sun. Understanding the origin, formation, evolution, composition, interior structure, and environment of Mercury plays a key role in deciphering the evolution of the terrestrial planets and solar system. This session welcomes contributions addressing the all aspects of planet Mercury listed above, based on modelling, laboratory experiments, observations from this and other missions. Submissions are also welcome describing BepiColombo’s science instruments as they begin their science phase.