The Search for Jesse Bram

Space alien cadet Jesse Bram is marooned on the shunned planet URth where all technology has been lost. A technocrat, Jesse carries the information that could rebuild URth technology, but URthlings are warlike and a threat to the Galactic Federation. The Federation fears Jesse is a traitor and sends a Trinian policeman to find him accompanied by his sweetheart Stella. In the meantime, the URthlings all think Jesse is something else. So who or what is Jesse Bram?