A hero must be willing to die. Domum is in turmoil when the ruthless Lord Darius vies to become King, overpowering and killing anyone who oppose him. To Liz's dismay Jon accepts the role to lead the undermanned Horstruff defences. Liz becomes worried Jon doesn't want to return to Earth and plans to give him ultimatum if he wants her, if he can even survive the conflict. Meanwhile Gilbert's reluctant marriage proposal to Donna takes a surprising turn. As the final battle looms he suddenly finds fate has placed him in the midst of the battle where he has a chance to be a hero.