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[WARNING: SPOILERS FOR UNDERTALE]
Frisk, also referred to as Sam (which turns out is the name of the fallen child , not Frisk) in Jack's playthrough, is the main protagonist of Undertale. Frisk does not have a set age, ethnicity, or gender. Frisk fell into the Underground one day and was attacked by Flowey. Toriel came to save the day and took them back to her house.