On Tuesday's show, she criticized Mack for not challenging her belief in UFOs, but did not mention her alleged undercover work.

MacLeish said the original version of the show contained "clear innuendo" that something "sexually inappropriate" took place between Bassett and Mack.

"We feel that it was completely inappropriate for the...program to put on Donna Bassett saying that preposterous story," MacLeish said.

Bassett claimed that she first met Mack alone in a private room at the Charles Hotel. But in a February 23 letter to WGBH-TV Boston, MacLeish said the first meeting between Bassett and Mack took place in the lobby or restaurant of the hotel, in the presence of Bassett's husband.

Mack also said he is not responsible for Bassett's belief in UFOs because her interest in UFO abduction can be traced prior to his meeting with her.

As proof, MacLeish presented a letter Bassett sent to author Whitley Striber 10 months before her meeting with Mack in which Bassett refers to her encounter with UFOs.

Beyond the alleged factual inaccuracies of the Bassett segments, Mack said the documentary was generally biased against people who believe in the possibility of UFOs.

"This is about the fact that this program has done a disservice to science and to a population," Mack said.

As an example, Mack says that the original version of the show was critical of Harvard for not stopping Mack's research.

But in 1995, Harvard Medical School investigated Mack's research and its findings, and "reaffirmed Dr. Mack's academic freedom to study what he wishes and to state his opinions without impediment," as stated in an August 3, 1995 press release.

However, a letter to Mack from Dean of the Medical School Daniel C. Tosteson '44 raised critical questions about the way Mack conducted his research