1) Sam struggles to support his friend Frodo on their journey to destroy the One Ring. He tries to understand Frodo's struggles with the ring but this causes Frodo to see him as a threat. Sam is stubborn and continues following Frodo despite being sent away. 2) When Frodo appears dead, Sam takes the ring but realizes its power. He returns it to Frodo and better understands Frodo's burden. 3) As Frodo loses strength, Sam forces him to keep moving and carries him up Mount Doom despite having no hope of returning home. Sam's hope and support allow Frodo to complete their quest.