OH MY GOD THAT WAS TERRIFYING.

Not enough can be said for this crew's specific ability of nailing tone. Abject terror flows from the point of Tennant putting his face to the glass and Donna realizing how far she is from her family, light, and all of existence. Genuinely frightened every time they all stared each other down. The budget is on full display here but it's those old darkened corridors and tight script that gets the job done.

God bless Davies for doing what needed to be acknowledged re: the Flux. Who better than Tennant to grapple with The Doctor's failings. Magnificent work all around.