The Jem'Hadar are the genetically engineered foot soldiers of The Dominion. The Jem'Hadar are reptilian in look. Unlike other humanoid species, they are genetically created rather than through procreation as humans are. The Jem'Hadar are brought to adulthood in three days.
The Dominion are the all powerful organisation that controls much of the Gamma Quadrant. The leaders are a group of shape-shifting aliens called Changelings/Founders who are mainly hidden from the rest of the galaxy. Constable Odo is a member of the Founders race. When Odo is given the choice of joining the Founders, he declines, instead, he stays with the Federation.
The Jem'Hadar are all male, there is no need for procreation so there is no need for a female Jem'Hadar. The Jem'Hadar have a personal cloaking field that allows them to sneak up on their enemies. They are the only race that does have that ability.
Although the Dominion are mentioned in the second series, it is not until the very last episode of the series that the Jem'Hadar make their first appearance. A squad of Jem'Hadar capture Benjamin Sisko, Nog, Jake Sisko and Quark whilst they are in the Gamma Quadrant.
The Jem'Hadar do not need to think twice before sacrificing themselves. During the first encounter with the Jem'Hadar, a Jem'Hadar craft smashes into the U.S.S. Odyssey, killing himself and destroying the Odyssey. It give the Federation an idea of what they are going to be facing. The Jem'Hadar
The Dominion keep the Jem'hadar in line by making them require Ketracel White as substanance. If the Jem'Hadar doesn't have Ketracel White, then they will die.
When Doctor Julian Bashir and Captain Benjamin Sisko are on their own in the Gamma Quadrant, they come across a Jem'Hadar soldier that is able to survive without his reliance on Ketracel White. The Soldier wants Bashir to work out how he can get his troops off the drug. Julian Bashir is forced to come up with a cure for Ketracel White but he is unable to. Benjamin remarks that it is wise to keep them on Ketracel White otherwise they could become an uncontrollable unless, at least the Founders are able to control them. Hippocratic Oath
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