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The endosymbiotic theory suggests that mitochondria orginated from where? | HIX Tutor

It is believed that mitochondria was its own entity before it moved into cells.
It was among the first organisms.
Atoms and molecules connected in different ways until a perfect combination occured: One molecule could take other molecules and replicate itself. 
Eventually they became mitochondria, amongst other things. At some point though, mitochondria moved into cells instead.

Ruby Armstrong

The endosymbiotic theory suggests that mitochondria originated from engulfed aerobic bacteria that formed a symbiotic relationship with early eukaryotic cells.