“Journey to the Microcosmos: What Are These Vorticella up to?” explores Vorticella, bell-shaped single-celled protists found in aquatic habitats. The video explains their life cycle from free-swimming youth to stalked adults, their cilia-based feeding, and their rapid defensive contraction using a myoneme. It also introduces related and neighboring microscopic organisms, including Stentor coeruleus, rotifers, nauplii, and Cyclops, highlighting food webs, biofilms, parasite hosts, and interactions in freshwater ecosystems. Historical and scientific context includes Antonie van Leeuwenhoek’s early observations and rare fossil evidence of Vorticella-like ciliates. Rich in microscopy vocabulary and life science concepts, this documentary-style video supports curriculum topics in microbiology, cells, organism structure and function, and aquatic ecology. Part of the "Journey to the Microcosmos" series.