Peter Harris (writer), Marzal Canos (pencils and inks), Tony Jacob (letters)
Published in 2000AD #15, 06/04/1977 - 6 pages
A group of British tourists were approached by the ruler of Bepal in the Himalayas to smuggle opium to the West. When they refused, they were attacked by an invisible death ray. John Probe, M.A.C.H. 1, is sent there to learn more and ends up meeting the ruler's Yetis.
Here are the pages I have of it.