I'm trying to remember a story as I would like to read it again but cannot remember the title.
Synopsis: a group of teenagers are on a spaceship, all are clones but don't know this due to some process (I think their skin pigmentation has been altered). Their minds individually travel back in time to remember their original lives. They're traveling around space in a gigantic Ark but don't know it's an ark initially. They are attacked by creatures created by the computer system that raised them (I think the computer is called COL but I could be wrong). They eventually make it to Mars to repopulate, only to find they are not needed or wanted there, so they carry on to Earth to repopulate this with life. I believe it was made into a TV series by Channel 5 (UK) back when they first began as a TV station.