The energy converting organelle found in both plant and animal cells is the mitochondrion.

Here's why:

* Mitochondria are often called the "powerhouses of the cell" because they are responsible for cellular respiration. This process takes in nutrients and oxygen and converts them into energy (ATP) that the cell can use for various functions.

While plant cells also have chloroplasts, which are responsible for photosynthesis, mitochondria are present in both plant and animal cells, making them the universal energy converters.