Cave-boy Glog is accidentally left behind when his tribe move to new hunting grounds - and things look bleak.

Glog will have to do the best he can to fend for himself until they come to find him.

Along the way, he encounters a ferocious wolf and gathers some new friends.

He draws them on the cave wall for company, but it's not the same as his own tribe.

Will Glog's family come back for him?