The Titans — Roger LeLoup

Yoko, Vic and Pol are back on Vinea after a two-month journey in hibernation. They've barely had time to wake up that the Vineans are already presenting them with disquieting news: plants of extravinean origin have been found in a remote part of the planet, as well as obvious signs of equally alien intelligent life - colossal in size. An expedition is sent to look for these titans...