Kenneth Crichton was next in line to take on the identity of Union Jack, but refused, stating that his friend Joey Chapman was better suited to be the new Union Jack in which Chapman agreed.
Suffering from anemia and feeling estranged from Joey as Union Jack and his recently rejuvenated mother, Lady Crichton, Kenneth became an easy target for Baroness Blood, who turned him into the new Baron Blood as a "cure" for his anemia. The Baroness used Kenneth and several other vampires to obtain the Holy Grail, which gave her immunity to sunlight and the other traditional weaknesses vampires had, but she didn't want to share this power with other vampires and destroyed the Grail. The sun rose and Kenneth and the other vampires all died, despite Union Jack's efforts to save Kenneth.
However, a spell mismanaged by Blade and his father inadvertently brought every vampire who ever died back to un-life, including Kenneth.
As Baron Blood, Kenneth joined Dracula, Lord of the Vampire, and his Vampire Nation in his campaign against London. He attempted to recruit his mother, Spitfire, to the cause. Spitfire and MI-13 ultimately manipulated Dracula's forces into ruin, and Jackie asked her lover Blade to end Kenneth's un-life, since she couldn't bring herself to do it.