https://www.amazon.co.uk/Lost-Universe-I-Keith-Brandon-ebook/dp/B01NA0GPXU
The great Ambassador Tekara Yuolin -a grey alien- who holds the Federation together. When the last remaining humans arrive from Earth soon they find out, that the invitation to find the 'end of the world' and join the aliens, was nothing, but a cover story in order to lure out humans to deep space and give them the impossible mission to save the future. The mission led by Captain Patrick, soon finds himself along with his crew in adventures and galactic battles, to save the day. Something he and his crew never dreamed of.
Lost Universe I -The saga begins!