It Chapter 1 & 2: Every Monster Explained & Ranked

8. Alvin Marsh

Bev Marsh's father was an unspeakable monster of his own creation well before It stole his image to haunt Bev as an adult. There's some complexity to him, because he lost his wife and blamed his daughter for it, but his abusive history with his daughter renders him entirely unsympathetic. He's a monster.

His return in Chapter Two, not only to fill in some of the gaps in their relationship is pretty grimly effective because it shows that Bev had to pretend to be complicit in their relationship (and that she had enough affection for him to kiss him while he was asleep before leaving Derry forever). And of course, he ends up being used as It tries to kill Bev off entirely, drowning her in a bathroom of blood to hark back to one of the most enduring images of the first movie.

He even gets a great little moment of breaking through the toilet door and shouting "here's Johnny" in honour of another of Stephen King's great works.