Gertie is a five year old girl, who is the daughter of Mary and the younger sister of Elliott and Michael. She has a mischievous and sarcastic personality. She is played by Drew Barrymore who also played Olive in Olive, the Other Reindeer, Jillian Russell-Wilcox in Family Guy, Akima Kunimoto in Titan A.E., Dylan Sanders in Charlie's Angels and Maggie Dunlop in Curious George.
She is initially terrified of E.T. when she first meets him but soon grows to love the little extraterrestrial. Before E.T. departs for home, she gives him the plant that he had revived early in the film, to which he gladly accepts.