Suzie Grogan was played by Shannon Collins in Piranha.
She is the daughter of Paul Grogan who has divorced her mother and left her with him. She is in the summer camp at the river while his father is at home during vacation.
She hates being in the water and stays away from it. She hates Mr. Dumont, the leader of the camp who insists she should be in the water, but also likes Betsy and Laura, his direct subordinates.
She stayed out of the water when the piranhas attacked them in the river. However, when she found out what was going on, she overcame her fears and managed to save one of them Laura, by using a plastic boat for that. Still she couldn't save Betsy.
She is later standing by her father, when he is treated because of his wounds caused by the piranhas after he killed them.