Former “Mythbusters” co-host Adam Savage allegedly sexually abused his younger sister for years while calling himself the “raping blob” during the late 1970s, the woman says in a lawsuit filed Tuesday.

Miranda Pacchiana claims the abuse happened when she was between 7 and 10 years old when the siblings lived in Sleepy Hollow.

“Beginning in or about 1976 and continuing until approximately 1979, Adam Savage, would repeatedly rape Miranda Pacchiana and force oral sex upon her, and forced Miranda to perform oral sex on him, along with other forms of sexual abuse,” her lawsuit, filed in Westchester Supreme Court, says.

The suit says Savage, who was between 9 and 12 years old at the time, would prevent Pacchiana from leaving the bed and anally rape her.

He allegedly nicknamed himself the “raping blob” while masking the abuse as a game, according to the complaint.

The 52-year-old special effects whiz is best known as the former co-host of “Mythbusters,” a Discovery channel series that tests the validity of popular myths and legends.

Pacchiana filed her lawsuit under the New York Child Victims Act, which opened a one-year look-back period for victims to bring claims that had already exceeded the statute of limitations. In May, the original deadline, which was set to end in August, was extended by five months due to coronavirus.

“The prolific abuse by Mr. Savage as alleged in the Complaint has caused irreparable damage to my client that she will live with for the rest of her life,” Pacchiana’s lawyer Jordan Merson said in a statement. “Today is the first step in the direction of healing and justice.”

Savage’s lawyer and rep didn’t immediately return messages.