The Powers of Matthew Star

1 9 8 2 (USA)
22 x 60 minute episodes

When the planet of Quadris was taken over by evil forces, the rulers sent their 17 year old son to Earth until his special powers had developed enough for him to return home and restore himself to the throne. 

The boy, Matthew Star and his guardian Walt took up residence in a small US town in this sci-fi adventure series from NBC. On Earth, Mathew took the form of an ordinary high-school student (albeit one with superpowers), while Walt became the school's science teacher. 

The American government (in their infinite glory and wisdom) already knew of Matthew and Walt's origin and powers, and used them to act as agents on occasion.