Star Trek

Enterprise: The First Adventure by Vonda Neel McIntyre (c) 1986. Pocket Books.

Now, the untold story - Captain Kirk's First Mission!

James T. Kirk is the youngest man to be promoted to the rank of captain in Federation history. His crew consists of a first officer who finds him impetuous; a chief engineer who finds him arrogant; a chief medical officer who finds him trifling; and a helmsman who wants a transfer.

But the young crew, which would later become the legendary space explorers, quickly puts aside their differences when a monstrous starship appears on their nascent flight path.

Wow - that's an old book!  I haven't read that one for years!