To the titular castle he'll slog
Where he'll fit a man's brain in a dog
Round the bend he's been trotting
His foe's endings he's plotting
His obit will read "Drowned in a bog."
The imprisoned and crazy Dr.Gustav Niemann seeks to continue Frankenstein's experiments in "eternal life": Boris Karloff stars in House of Frankenstein (Erle C. Kenton, 1944). Note the chalk diagram of a dog-human brain transplant drawn on the cell wall.