"Nightmare (in a damaged brain)" is a dark and sinister mixture between William Lustig´s "Maniac" (1980) and John McNaughton´s "Henry: Portrait of a Serial Killer" (1986). The nightmarish atmosphere of Scavolini´s film is combined with some creepy and bizarre flashbacks - the most memorable one is the scene when young madman George Tatum beheads a prostitute and splits the head of his father with an axe..! Gore galore!! Main actor Baird Stafford is almost as great as the legendary Michael Rooker, supporting actor Mik Cribben filmed some years later the Troma-shot "Beware! Children at play"... "Nightmare" is one of the most disturbing, but also fascinating movies about psycho-killers that deserves much more praise and attention than it actually gets!!