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"Hosts" was the first of two stories in the fourth issue of John Byrne's TOS miniseries Leonard McCoy, Frontier Doctor. This story picked up where "Medics" left off, with Leonard McCoy, Gary Seven and Roberta Lincoln aboard the USS Yorktown under the command of Number One.

Publisher's description

Dr. McCoy must find a way to deal with a virus that just may be smarter than he is.


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All'o'pollaBrianChristine ChapelJon Mikael DuncanCharles GibneyKovicRoberta LincolnSusan M'BengaMahlerLeonard McCoyNumber OneOshiroGary SevenTheelaSigma Thernia IIIB intelligent virusunnamed USS Yorktown personnel (transporter chiefs, medical officers, bridge crew officers)
Referenced only
Beta 5 computerElizabeth DehnerJames T. KirkGary MitchellCurtis Wellborn

Starships and vehicles

USS Yorktown (Constitution-class heavy cruiser)
Referenced only
USS Enterprise (Constitution-class heavy cruiser)


Alpha Tau IVOrion sectorSigma Thernia 3B
Referenced only
Earth (Vietnam) • Sigma Thernia III

Races and cultures


States and organizations


Science and classification

biobedcommunicationscontainment fieldcontamination suitcoordinatescryo-stasisdecontaminationintercomlife supportlinguisticsmathematicsmedical tricorderPADDphasertime traveltranquilizertransportertricorderuniversal translatorviewscreen

Ranks and titles

admiralcaptainchief nursecrewmemberdoctorensigngynecologistlieutenant

Other references

20th centuryantarthropodassignment patchbackpackbirdbloodbrainbridgebridge crewChristmasclonedaydaydiseaseDNAengineeringevolutiongasgas gianthistoryhivehive mindisolation wardlanding partylanguagelifeformlog entrymilitaryminutemonthorbitorganismquarterssickbayStarfleet uniform (early 2270s)transporter roomviruswormyear



21 December 1970
24 December 1970
  • Seven and Lincoln return to Earth at this date.

Production history

28 July 2010
First published by IDW Publishing.
27 October 2010
Collected in the Leonard McCoy, Frontier Doctor miniseries omnibus.
28 May 2013
Reprinted in hardcover in The John Byrne Collection omnibus.
31 December 2015
Reprinted in paperback in The John Byrne Collection omnibus.
3 January 2019
Reprinted in hardcover in the omnibus Graphic Novel Collection #53. (Eaglemoss)



Related stories



Leonard McCoy, Frontier Doctor stories and publications
#1: "Weeds" • #2: "Error" • #3: "Medics" • #4: "Hosts" & "Scalpel"
Media featuring Gary Seven
Episode Assignment: Earth
Miniseries The PeacekeeperConvergenceThe Eugenics WarsAssignment: Earth
Novels Assignment: EternityThe Rise and Fall of Khan Noonien Singh, Volume 1The Rise and Fall of Khan Noonien Singh, Volume 2From History's ShadowElusive Salvation
Short stories "The Aliens Are Coming!" • "Seven and Seven" • "Assignment: One" • "Rocket Man" • "Time Line"
Comics "The Peacekeeper, Part One" • "The Peacekeeper, Part Two" • "Split Infinities" • "Future Imperiled" • "Brighter Than a Thousand Suns" • "Yesterday, Today and Tomorrow" • "My Name Is Legion" • "We Have Met the Enemy..." • "Too Many Presidents" • "Ah-Ha!" • "Medics" • "Hosts" • "1971/4860.2" • "An Unexpected Yesterday" • "Year Five, Issue 11" • "Year Five, Issue 12" • "Year Five, Issue 15" • "Year Five, Issue 16" • "Year Five, Issue 17" • "Year Five, Issue 21" • "Year Five, Issue 22"
Published Order
Previous comic:
TOS comics
(Leonard McCoy, Frontier Doctor)
Next comic:
Chronological Order
Previous adventure:
Memory Beta Chronology Next adventure:
Previous story:
The adventures of Gary Seven Next story:
We Have Met the Enemy...

External links