As the witches prepare an immortal spell, Binx is transformed into a black cat much to their devious plans. As Thackery notices the Sandersons preparing a spell, he tips over the cauldron after noticing what the witches are doing. Arriving at the cottage, Thackery plans to rescue her from Winifred Sanderson and her sisters. In 1693, Thackery Binx notices his sister, Emily taken away far from the woods by the Sanderson Sisters in fear. Thackery Binx is a short haired black cat with yellow (golden) eyes and black paws. During his time with the children, he becomes attached to Dani and cares about her. He is also cautious, as demonstrated when expressing that the spellbook must be kept shut. He has also been shown to be a loving brother to her, as he was determined to save her from the sisters, even though he failed. Thackery is shown to be a caring, brave, and determined character, as he cares about his family, and also, after he loses Emily, he becomes determined not to fail anymore, no matter what it takes. He leaves with Emily when saying goodbye to Max, Dani, and Allison. When the Sanderson Sisters disappear off the face of the earth at sunrise, his soul is freed. During the adventure, he quickly takes a liking to Dani, and bonds with her. In 1993, when a teenage boy named Max Dennison accidentally brought them back, he acted as a guide for him, his sister, Dani, and his crush, Allison.

At some point afterward, he decided to guard the house every Halloween night in order to prevent the sisters from returning. After the sisters were hanged, he was unrecognized by his family and was abandoned.

One day, he followed her into the woods but was unable to rescue her from the three Witches, and after insulting Winifred, he was transformed into an immortal black cat. Thackery was a 17th-century boy living with his parents and his sister, Emily.

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