Abstract: The ICARUS experiment employs a liquid argon (LAr) time projection chamber (TPC) detector, a sensitive detector medium for neutrino studies and rare event searches. The ICARUS T600 detector was installed at Fermilab after its run in Italy: it is now beginning physics running and preparing for analyses. A main goal of the project is to search for sterile neutrino signatures as the far detector in the Short Baseline Neutrino (SBN) program. ICARUS has a broader wealth of additional physics aims, including cross-section and interaction measurements - especially using neutrinos from a second beam (NuMI) - and beyond standard model searches. This talk will discuss ICARUS, highlighting some of its physics possibilities, and its activation, commissioning, and status.