Brian Cox explains the origin of the mitochondrial symbiotic relationship with the cell. He starts with introducing the nucleus and gives context to the early cell types - prokaryotes and eukaryotes. Brian then explains what scientists believe was the beginning of a symbiotic relationship where a bacteria enters an archaea. 

A brief lesson on the origin of mitochondria and symbiosis.

Hank explains the inner workings of a eukaryotic cell and the role of several organelles. He compares the way a cell functions to a city with a fascist government, which he calls "Eukaryopolis." Key Words: Eukaryote, Prozac, Flagellum, Cilia, Microtubules, Cell Membrane, Cytoplasm, Centrosome, Nucleoplasm, Vesicles

Hank illustrates the differences between plant and animal cells. Both are eukaryotic cells, but they have their own unique characteristics. Hank also explains why humans cannot eat wood and plants in the way that other animals can. Key Words: Eukaryotic Cells, Prokaryotic Cells, Organelles, Cytoplasm, Cell Wall, Cellulose, Photosynthesis, Plastids, Chloroplasts, Central Vacuole

Hank explains the role of the nucleus in a eukaryotic cell. He backs up his explanation with compelling visuals.