This issue is a variant of The Avengers (Marvel, 1963 series) #244 [Direct Edition]. There exist further variants.
Although all male Dire Wraith scientists were shown to be killed in Rom (Marvel, 1979 series) #48, this story clearly shows that some of them survived.
Letters on The Avengers #239. Short fan letter from David Letterman concerning his appearance in that issue. Question of the Month "What is your biggest pet peeve?" asked to Stern, Milgrom, Sinnott, Novak, Scheele, Carlin, Gruenwald and Shooter; Special Announcements Section. Letters from Randy Zimmerman, Ned Harper (David Letterman Exclusive Club), James Ryley, Howard W. Stangroom, Susan Murrie, Dave Letterman