Mark is hit at his birth by a bolt of lightning which kills his mother but makes him almost invulnerable: Only the "Red Flower" can harm him, though nobody knows what it is. Unfortunately, he is soon thereafter kidnaped and made the chief warrior of a desert bandit tribe led by Mimmo Palmara, which tries to sack Mark's city of birth. Two great scenes: Mark, without knowing it, has to fight his own brother in a whipping and wrestling duel in the mountains. And: Mark lets himself be put into an iron maiden to prove that he cannot be harmed; he steps out of it and simply states, "I am invulnerable." Extra wooden acting during love scenes (even in comparison to other products of Italian popular cinema of this time)!! Low production costs, partially boring. Recommended for fans of Mark Forest or Italian trash cinema only. Almost the bottom of the barrel. Rosalba Neri has only a very small part to play, which is a pity.