Dahak (Hercules and Xena)

Dahak, the One Evil God, was the impulse of destruction, a powerful, ancient evil being and a recurring character on both Xena: Warrior Princess and Hercules: The Legendary Journeys. Although his true form has only been seen once or twice on-screen, he possessed Iolaus's dead body. He impregnated Gabrielle with Hope, his one daughter and representative on Earth. He was one of the main causes of the Rift and the events that later led to Gabrielle's apparent death.

Prelude to the Dark One's Arrival
Whilst in Brittania, Gabrielle grew close to a follower of Dahak, Krafstar. He spoke about Dahak in way that Xena and Gabrielle thought he referred the one God of the Israelites. Gabrielle soons discover that this Deity and his followers are part of a sinister and dark cult, devoted to unleashing evil onto the Earth. Gabrielle is tricked into killing a member of the cult and then impregnated with Hope, the bringer of Evil.

Dahak then attempts to release his army of evil onto the Earth, through Hope and Ares. He is then slowed down by Xena, who manages to kill the Destroyer, his grand-child, who kills Hope with it. Dahak may be the most powerful and dangerous of all the antagonists of both series.

Gabrielle's Impregnation
While Xena and Gabrielle are traveling they come across some guards taking some prisoners to Britannia for trial. As they passed them Xena heard one of the prisoners mentions that they will never give in to Caesar. Upon hearing Caesar's name Xena battles the guards and releases the prisoners. One of the prisoners named Krafstar, informs Xena that Caesar has captured their temple, as well as they have hired Boadicea, Xena's former ally, to help defeat Caesar.

Xena and Gabrielle travel to Britannia with Krafstar to help Boadicea. Gabrielle talks to Krafstar about his "one God" and seems to make a friend in him. Krafstar uses his friendship with Gabrielle to trick her into killing Meridian, as well as therefore, losing her blood innocence, which is what Dahak needs to be able to enter the physical realm. Xena sees strange dark clouds above the temple and fearing for Gabrielle's safety, she rushes to the temple. When Xena enters the temple she finds it deserted, with a dead woman laying on the alter. She sees Gabrielle crying in the corner and asks her who had done this and Gabrielle tells her that she had. Krafstar enters the temple, as well as him and Xena fight. The alter bursts open and flames grab Gabrielle, as well as dangles her in mid-air. Krafstar transforms into "The Deliverer". Xena Throws Krafstar into the flames and catches Gabrielle before she falls into the pit. Xena and Gabrielle take safety before the temple explodes. Dahak managed to impregnate Gabrielle before Krafstar defeat.

Hope
Gabrielle carried Dahak spawn for two weeks before giving birth to a daughter. Even though she is the seed of evil, Gabrielle tells Xena that because she is a part of her and that there must be some good in her as well: naming her Hope. Xena feared that Hope would be used as a pawn for Dahak, so Xena decides to kill her. Gabrielle, fearing safety for her child, sent Hope downstream in a basket, in secrecy from Xena.