The Earthquake of MetalGreymon

The Earthquake of MetalGreymon is the twentieth episode of Season 1 in Digimon Adventure, and the twentieth episode overall.

Synopsis
Tai and the group realize that Sora and Datamon never left the pyramid, so they figure out where Datamon is at. Tai, Izzy, Agumon, and Tentomon plan a rescue mission, but they'll have to go through an electric wall to succeed. Can Tai conquer his fears to save Sora?

Trivia

 * Greymon is first Digimon to digivolve to Ultimate form.