The Heechee are a fictional alien race from the science fiction works of Frederik Pohl. The Heechee are portrayed as an exceedingly advanced star-travelling race that explored Earth's solar system millennia ago and then disappeared without a trace before humankind began space exploration.
The Heechee first appeared in "The Merchants of Venus" (1972), a novella in the collection The Gold at the Starbow's End, sometimes called "The Merchants of Venus Underground". They also are referenced or appear in many of Pohl's novels and short stories published between 1977 and 2004.
Pohl's novels featuring the Heechee are:
1-Gateway (1977)


2-Beyond the Blue Event Horizon (1980)


3-Heechee Rendezvous (1984)


4-Annals of the Heechee (1987)


5-The Boy Who Would Live Forever: A Novel of Gateway (2004)