Bigfoot was a mythological creature supposedly native to Earth.
In 1974, Carlos Quintana reminded Roberta Lincoln of a robot Bigfoot she had encountered "up north". (TOS novel: The Rise and Fall of Khan Noonien Singh, Volume 1)
- This is a reference to the Bigfoot which appeared in a number of episodes of The Six Million Dollar Man.
In 2274, Spock encountered a large anthropoid creature which bore similarities to Bigfoot. (TOS novel: Triangle)
In 2378, Admiral Alynna Nechayev told Captain Jean-Luc Picard during his court martial that relying on Data's testimony was like having Bigfoot as a star witness. (TNG novel: A Time to Be Born)
In 2383, Guinan was reminded of Earth legends, citing the Loch Ness Monster, Bigfoot and the Flying Dutchman, when describing her hunch about a missing ship to Geordi La Forge. (TNG novel: Indistinguishable from Magic)