Any religion
This post may include affiliate links.
Achilles and Heracles. No it’s not a typo. His Greek name was Heracles but the Roman’s twisted it into Hercules
The flyting for Kvasir’s mead in Norse mythology. A flyting is basically a challenge where the opponents insult each other until someone is forced to give up
Achilles
Marion Zimmer Bradley penned a great novel about that legend called "The Firebrand" that told the story from the women's perspectives (similar in the way that she wrote "The Mists of Avalon" about the Arthurian legend).
Bigfoot!
Man, sometimes you just want something to be true. Same goes for unicorns, dragons and the Loch Ness Monster.
The legend of King Arthur ("Mists of Avalon" version)
Hachishakusama, or the eight-foot tall woman
I am not familiar with this one. I shall endeavour to look it up.
Mine would be the fox who turned a summersault from Japanese folklore. (It also was made into a love+death+robots episode.)
Torn between El Silbón (https://www.youtube.com/watch?v=Am6PkJ1seGI) and Baba Yaga (https://www.youtube.com/watch?v=aS4VCxMeWQM)