The video "Journey to the Microcosmos: Where Did Eukaryotic Cells Come From?" explores the history and significance of eukaryotic cells in life on Earth. It discusses the transition from simple prokaryotic organisms to complex eukaryotic cells, which feature membrane-bound organelles. The key concept of endosymbiotic theory is highlighted, explaining how cells engulfed others, leading to the development of mitochondria and chloroplasts. The video uses examples such as Paramecium bursaria and testate amoeba to illustrate these symbiotic relationships and their evolution. This content is relevant for understanding cellular biology, evolution, and the diversity of life, enhancing education for school science programs. Concepts such as anaerobic environments, methanogens, and the role of archaeans are also introduced, providing a comprehensive overview of early life forms. This educational video is valuable for school programs focusing on biology, evolution, and microbiology.