First, after getting a hold of the Winter Soldier's code book, he disguises himself as Bucky and bombs a peace summit. This starts a manhunt for Bucky with orders to shoot on sight (which even Bucky notes is a smart play), and because of the Accords, Captain America isn't allowed to interfere. Cap interferes, causing tension in the team. Once Bucky is arrested, Zemo goes to talk to him as the UN-sanctioned psychologist (having killed the real one), has an EMP take out the power, and while the cameras are down, activates Bucky using the code phrase and sends him on a rampage. As Cap is rescuing Bucky, Zemo drops hints that he is going to recover the other five Winter Soldiers from stasis and unleash them on the world, convincing Cap that there's no time to sit down and come to a peaceful solution with Tony. Instead, Cap and Bucky escape to Russia after a huge fight, resulting in Rhodey's injury and the imprisonment of the rest of Cap's team. Then, Zemo allows the corpse of the psychiatrist to be found, letting Tony realize he's been played and following Cap to Russia to help. Then Zemo reveals he killed all the sleeping Winter Soldiers, and shows Tony footage of Bucky killing his parents, which sends Tony into a rage.
it's too early to tell if I like Holland better than Garfield, but Homecoming will be absolutely lit 
