“Journey to the Microcosmos: Meet the Microcosmos” introduces the microscopic world through aquatic ecosystems and microscopy. The episode explains three major groups of organisms commonly observed in microhabitats such as pond water, soil moisture, and moss: prokaryotes, single-celled eukaryotes (protists), and micro animals. Key biology concepts include cells, organelles, bacteria, cyanobacteria, photosynthesis, chloroplasts, mitochondria, flagella, diatoms, ecosystems, and magnification. The video also highlights how microorganisms interact in food webs, convert light into energy, sense their environment, and survive in diverse habitats. With clear scientific vocabulary and observational context, this overview supports life science curricula related to cell structure, classification of living things, ecology, evolution, and microscopy. Part of the "Journey to the Microcosmos" series.