One of the aliens comes over and stares down at him with its three purple eyes. "How do you feel now, human?"
"Wow! You guys speak English!" Damon is glad to be able to understand what is being said. "Why didn't you talk to me before?"
"We are not speaking your language. You now understand ours." The alien taps the helmet-like thing. "We upgraded your brain to be less primitive."
Damon is confused at first, then realizes he is not actually hearing English. The sounds that the aliens make are still in the background, but his mind just translates. And when he speaks, he is making weird sounds like the aliens. "So now I speak alien!"
"You speak all languages known to exist on your planet, plus ours."
A recorded voice says "Are you the Gods? Have I been taken to the Beyond?" The alien says "That is a tribesman of a lost South American tribe that has never met other humans. He is speaking the language only his tribe knows."
Another alien comes over and asks "What is the square root of 942,371?"
"970.7579512937301." Damon replies with the answer automatically, as if he had been asked what is 2 + 2. "Huh?"
The first alien nods. "Your brain is now faster than even the most sophisticated of your world's artificial intelligences."
Damon's eyes widen as he discovered that his mind is full of every fact there is to know - his brain is like a super-fast Google search, with the correct answer to any question.
"Now that we know we can modify your brain, we can see about modifying your body." The second alien holds up a strange device and starts to press buttons.