The whole between psyche and flesh, the body that changes in relation to the psychological condition, therefore the mutations, the new essences with actually new beings born from this condition ready to release anger.
Cronenberg is the philosopher of the flesh par excellence, The Brood is part of his initial cycle of films where he manifests and expands his themes, his poetics and refines his style.
The entire ending of the film is wonderful, the now iconic scene of Nola raising her dress to show the "brood" is part of the horror anthology as well as the twins of Candice, daughter of Nola and Frank, born from this altered condition of Nola and therefore malformed, ready to kill are excellently handled at every signal sent by her mother.
Poor Candice lives in a highly dramatic and nightmarish context, not only is her mother in a treatment center but she sees violence repeatedly so the ending is emblematic with those two lumps that appear they see in the little girl's body, she is also changing because of everything she has experienced and the final shot on the eyes is cinema.
The photography is also noteworthy, the dark tones are excellent, the shadows on the faces and a darkness that pervades the film which combines well with the green notes creating anxiety.
The prologue is also excellent with the dialogue between Doctor Hal and the patient in the treatment center with a totally black background where the patient will show his cocoons and which shows Hal's treatment method.
Cronenberg would later make indisputable masterpieces, The Brood together with the previous ones Rabid and Shivers form a triptych of his beginnings where he explores his philosophy of the flesh, of body horror, therefore of the mutations of the body combined with psychology or in any case with a new essence of man also in relation to society.
Beautiful and important step for the director who refines his style and brings him closer to that masterpiece which he will direct a few years to come, Videodrome.