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.
The virus inside Cyborg tried to attack a cell that multiplied to fight the virus. The cell that multiplied went throughout his body to his nose and Cyborg sneezed out the virus. He was no longer controlled by the virus and he felt better.