Marvel Two-in-One (1974) #54
As Ben Grimm wanders the halls of Project Pegasus, he is attacked by the Nth Command's agent, Deathlok. When Thing tries to reason with Luther Manning, the cyborg reveals that he no longer possesses an organic mind and is all A.I programming!
Stories
writer
Mark Gruenwald
penciler
Joe Sinnott
writer
Ralph Macchio
letterer
John Costanza
penciler
John Byrne
colorist
Bob Sharen