Wait in this universe wouldn't Sans be kinda a jerk scene he could of saved everyone and not make Asgore kill 7 children because literately he could just get all of the monsters into the humongous time travailing machine. And the against argument of the tardis maybe can't go through the portal, it can still go back to when the barrier wasn't created and then go out of the underground and go back to the future. And the agenst argument that it's broken one mean the doctor in the underground where he could probably figure a way out and that mean a ship with the capability of getting hit with countless lazier beams I think not. Also amazing picture!