Watch Dragonheart: Battle for the Heartfire (2017) HD Full Movie Free on SolarMovie. Watch Dragonheart: Battle for the Heartfire (2017) online free. A dragon known as Drago tries to end the rivalry between a brother and sister, both having dragon-li...A dragon known as Drago tries to end the rivalry between a brother and sister, both having dragon-like powers, who are after the throne of their grandfather, while a new threat steals Drago's source of power.