Virtually the only connecting links between the innumerable colonized planets were the Med Ships—lone starships carrying only one man and one beast. These trained teams of super-medical engineers took their lives in their hands on every planetfall. And for the team of Calhoun and Murgatroyd, three calls for help meant three challenges beyond all the experiences of all their systems. Plague, mystery, and menace marked the missions—and the human enemies they faced on each world were just as virulent as the microscopic ones.

Space Doctor. Roving through the uncharted vastness of deep space, Med Serviceman Calhoun of the Interplanetary Medical Service brings his mission of healing to isolated colonists far from Earth. Alone in his starship with only his pet tormal for companionship, Calhoun plunges into an uncharted void without stars or nebulae...discovers a planet whose inhabitants starve to death amid a bounty of food...and dares a quarantined world ruled by galactic untouchables! 1 • The Mutant Weapon • (1959) 99 • Plague on Kryder II • (1964) 153 • Ribbon in the Sky • (1957) 201 • Quarantine World • (1966) 267 • This World Is Taboo • (1961)

The only links between the far-flung space colonies were the Medical Services spaceships. When these lonely travelers paid a call, they were always given a royal welcome. So why did the landing grid on Marix III try to destroy Med Serviceman Calhoun's ship?

Contents: 7 - The Grandfather's War 75 - Med Ship Man 120 - Tallien Three (aka The Hate Disease)

Land on Dara? One might as well commit suicide! Untouchable, like the Darans—that's what they'd call Calhoun if he broke the quarantine. And they'd wipe him out on sight. But Dara needed him and that was the kind of challenge this Interstellar Med Serviceman would never dodge.