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When a supernova is positioned behind a massive lens galaxy or cluster, it can be gravitationally lensed to form multiple images. This phenomenon is extremely rare and powerful, as it reveals more about high-redshift supernova physics, substructures in massive galaxies, and the expansion of the Universe. Last week, we released the fourth ever observed multiply imaged supernova, which we discovered with the Zwicky Transient Facility and baptised ‘SN Zwicky’. In this colloquium, I will present the discovery story of SN Zwicky and look ahead to the next generation of transient surveys. In particular, I will highlight several ongoing efforts within the Legacy Survey of Space and Time (LSST) that are aimed at identifying lensed supernovae and employing them for cosmological inference.