Uploaded November 2015 | Updated September 2026, 1 hour ago

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I tried to limit the spoilers to the fight itself rather than the plot, but the boss's identity is a rather big one. You've been warned!
If any of you haven't played Undertale yet, I highly encourage you to. Don't let the graphics fool you; the story and characters are fantastic. Don't resort to simply watching someone else play it for you; this is a game meant to be experienced for yourself!

You can pick up the game from Steam if you haven't already: store.steampowered.com/app/391540

This was part of a recent pair of Undertale runs I streamed on Twitch last week (pacifist and genocide, both on twitch.tv/universalgiant/profile). The streams will be archived for another week or so if anyone is curious enough to watch them, but I have no intention of bringing them over to YouTube.