Like his twin, Keel they spent their life on a space station with their parents. However when it was found out that the station would fall into the atmosphere and burn up- so he and his brother and their mother left- taking the only shuttle down to earth.
Their father chose to stay in the station to continue mapping the new earth (Since the “Hammer of Eden” changed the landscape so much).
The shuttle caught fire and Teen and his mother were lost in the ocean (Keel having been ejected). Some time later, Teen was found by caption Gould, floating in the ocean and rescued.
He later served on Gould’s sub as an Adjutant. Even though he has an Aquaphobia - due to his experience before the crew found and saved him.
Gould became like a foster father and the crew of the sub was like a foster family to Teen.