It is of course in the framing narrative of Walton's account of his attempted voyage to chart a passage through the North Pole and reach it for the first time that he and his men see both the creature, who is "apparently of gigantic stature," and then a little later on, Victor Frankenstein himself, who is taken aboard the ship and then is free to begin the centre story of this excellent tale. As we continue to read this story, Victor Frankenstein himself tells us what links the creature and himself together. Frankenstein gave the creature life through a scientific experiment, and as his creator he feels bound to follow his creation for the rest of his life and make sure that he dies. Having unleashed such a terror on the world, Victor Frankenstein feels a moral obligation to ensure that it dies without ending the life of any more humans, as he has suffered so much with the deaths of his close ones thanks to the monster. Note what Frankenstein pledges in one of the last chapters:
Again do I vow vengeance, again do I devote thee, miserable fiend, to torture and death. Never will I give up my search until he or I perish and then with what ecstasy shall I join my Elizabeth and my departed friends, who even know prepare for me the reward of my tedious toil and horrible pilgrimage!
Thus what links them, in addition to the bond of created/creator, is Frankenstein's desire to undo the wrong he has done and eliminate his creature from the earth.