- "Come now Derpy, lets head to bed."
- —Jaeger to Derpy.
Arthur Jaeger was a famed prodigy of Massachusetts Institute of Technology on Earth. He'd credited in the school of engineering involving virtually every subject of science and knowledge, especially power armour infantry technologies. However in secret, he'd was in the study of trans-dimensional travel with the invention of the Dimensional Communicator which caused a major miss-alingment of the Jaeger dimensional theory and had him travel to My Little Pony dimension, where he'd appeared alongside Cougar.
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