TV Heartland Heartland 6.5/10 by 2 users Dr. Nathaniel Grant is a pioneering organ-transplant surgeon who takes risks that other doctors would not in order to save the lives of his patients. He works closely with his ex-wife, Kate Armstrong, an organ-donor coordinator with whom he has a volatile relationship. Grant's arrogance and willingness to perform risky procedures causes him to butt heads with the hospital administration. But his main focus is on his intense relationship with his job and his patients, often at the expense of his family. Details Casts Posters Images Title Heartland Alternative Titles First Air Date 2007-06-18 Last Air Date 2007-08-20 Number of Episodes 10 Number of Seasons 1 Genres Drama, Networks TNT, Casts Treat Williams, Danielle Nicolet, Morena Baccarin, Kari Matchett, Gage Golightly, Rockmond Dunbar, Chris William Martin Plot Keywords sea, flying saucer, submarine, ocean, diving suit, secret mission, insanity, nuclear missile, u.s. navy, alien life-form, ufo, warning, scuba diving, underwater, scuba, extraterrestrial life form, deepsea, message, trapped underwater , thalassophobia, Dr. Nate Grant Treat Williams Mary Singletary Danielle Nicolet Jessica Kivala Morena Baccarin Kate Armstrong Kari Matchett Thea Grant Gage Golightly Dr. Tom Jonas Rockmond Dunbar Dr. Simon Griffith Chris William Martin