“Journey to the Microcosmos: Stentors--Single-Celled Giants” explores Stentor, a genus of giant single-celled eukaryotes found in freshwater habitats worldwide. The video explains key life science concepts including ciliates, cilia, organelles, endosymbiosis, photosynthesis, regeneration, the macronucleus, polyploidy, and genome structure. It highlights how Stentor can anchor with a holdfast, capture prey through a cell mouth, repair damage, and in some cases regenerate from cell fragments. Viewers also compare Stentor coeruleus, known for its blue pigment stentorin, with Stentor polymorphus, which contains symbiotic algae. With strong connections to biology, cells, genetics, microscopy, and organismal adaptation, this video supports curriculum topics in life science and scientific observation. Part of the "Journey to the Microcosmos" series.