in The Superman Family (DC, 1974 series) #167 (October-November 1974)
in Superman Presents Superboy Comic (K. G. Murray, 1976 ? series) #98 (Circa 1975-1976)
in Superman in the Sixties (DC, 1999 series) #[nn] ([September] 1999)Mind Prober Ray story. Brainiac mentions that his home planet is Bryak, and that its population was wiped out by a plague. An editor's note says that Brainiac has a 200-year lifespan.