Back to the Future Part II - Characters & Cast

To save his future family and subsequently undo the damage caused by his own greed.

Marty struggles with his ego, particularly the word "chicken." In this installment, he learns the hard way that his impulsivity can ruin his life, setting up his eventual maturation in the final film.

To maintain the integrity of the space-time continuum at any cost.

Doc moves from being purely fascinated by the future to being horrified by its vulnerability. He becomes a temporal moralist, ultimately deciding the time machine must be destroyed.

To dominate others through wealth and intimidation.

Biff exists as three versions: the pathetic 1985 loser, the arrogant 2015 relic, and the monstrous "Hell Valley" tyrant. He represents the darkest impulses of capitalism and power.