It's Valentine's Day in Craig's world, and everyone is on edge to get something special for that special someone, including Craig himself. But Craig's Valentine dilemma seems miniscule compared to the dire situation faced by the demonic beast-turned superhero Hellboy, when he's accidentally dropped off in the wrong dimension. The world in which he's trapped is Baltimore, Maryland in 1962 where a high-security government laboratory is holding both him and a humanoid amphibian creature, under the ruthless care of Colonel Richard Strickland. Now, it's up to Kara (the 13th incarnation of Neas the Gladiator of Gallifrey) and Craig, along with Bryson (Craig's cousin) and Mireya (the 7th incarnation of Neas's father, Aznavorian the Tinkerer), to save these misunderstood monsters.