Off the Rails (Undertale)

"Off the Rails" is the fifth episode of the Undertale Genocide run on Steam Train.

Gameplay
Ross and Barry heed a warning from Sans, and advance to Snowdin Town, which is deserted after all the monsters have either fled or been killed.

Papyrus confronts them at the end of their path, asking them to change their ways and realize the goodness within them. Ross leaves the room as Barry does the deed, murdering Papyrus at his most vulnerable. Both Barry and Ross are heartbroken.

Discussions
Ross and Barry get a phone call in the game, asking for a person whose name starts with "G" before singing the Wrong Number Song. Ross and Barry assume this is a reference to Gaster, a secret character in the game.