Hellboy: Sword of Storms is the first of the Hellboy Animated series based on Mike Mignola's popular comic book series Hellboy and the live-action film of the same name. It first aired in 2006 on Cartoon Network and was released on DVD in February 2007.

The film was produced by Starz Media's Film Roman and Revolution Studios and co-produced, co-written, and directed by animation veteran Tad Stones. Stones is perhaps best-known as the creator of the popular Disney afternoon series Darkwing Duck. Tad also worked with Mignola on developing Atlantis: The Lost Empire into an animated series.

Hellboy: Sword of Storms begins when a Japanese professor of folklore named Professor Sakai opens a forbidden scroll and becomes possessed by the ancient Japanese demons of Thunder and Lightning, who seek to return and summon their brothers, the Dragons, to dominate the human world.

The Bureau for Paranormal Research and Defense is brought in after Sakai attacks one of his associates. Hellboy and a team of agents (including Kate Corrigan) investigate the possessed man's rampage, but when Hellboy picks up a mysterious, discarded samurai sword, he literally disappears into a weird wonderland of Japanese mythology. On his quest to return to our world, he encounters many monsters (yōkai), including the kappa, a giant oni, a kitsune, rokurokubi, a tsuchigumo spider-woman, and three restless ghosts. Hellboy also meets a group of nukekubi in a segment of the film that is adapted virtually verbatim from the comic book story, Heads.

In dual side plots, BPRD agents Corrigan and Russell Thorne (a psychic) follow the trail of the possessed professor, while Abe and Liz are stranded on an island in the middle of the ocean.

Hellboy: Blood and Iron is the second in the Hellboy Animated series (the first being Hellboy: Sword of Storms), written by Tad Stones and Mike Mignola. It first aired in March 2007 on Cartoon Network and will be released on DVD by Starz Home Entertainment in June 2007.

In 1939, young Professor Bruttenholm (affectionately nicknamed "Broom" by his colleagues and students) destroyed Erzsebet Ondrushko, a vampiress who bathed in the blood of innocents to stay young after selling her soul to the Queen of Witches, the goddess Hecate. Years later, a haunting at upstate New York is brought to the BPRD's attention. The elderly Professor Bruttenholm decides to investigate it himself, taking top BPRD agents, Hellboy, Liz Sherman and Abe Sapien, who are more worried about his welfare than a haunting.

Much to Broom's horror, it turns out that the ghosts are the victims of Erzsebet Ondrushko, who is soon resurrected by her two harpy/hag servants. While the others deal with her minions and Broom settles his affairs with Erzsebet once and for all, Hellboy ends up battling Hecate herself, who has been watching him for some time and desires him to embrace his true destiny: one that includes the destruction of mankind.