A Sintillian was a race of alien, introduced in Men in Black: The Series. They are reptilian/dinosaur and vaguely human-like in their appearance. Sintillians walk on two legs, and wear clothes like humans, but they do have a long tail. They also have a long mouth, ten eyebrows, and a long tail on the back of their heads.
Abilities[]
Most of what they can do is unknown, but it is shown that they can open up their chests to show organs. And according to Kay, they have 2 hearts that never stop beating, making them immortal. The concept still stays with them as long as they have at least one heart, and no one "drops a piano on them".
Story[]
In The Alpha Syndrome, a Sintillian comes to MiB with a problem. He shows Jay that he has lost his heart. He reveals that it was stolen right from his body. After long investigating, Jay and Kay find the culprit is Alpha, a former MiB agent, who left Kay for dead long ago. Alpha shoots the Sintillian Heart, but they are able to save the heart and the Sintillian.