Dick Powell's Zane Grey Theatre (1956)

S18E20 Warriors' Gate (4)

The Doctor realizes that the cargo ship is a slave vessel filled with Tharils, intended to be sold as parts for time machines. However, the massive weight of Rorvik's compromised ship, engineered to hold the Tharils, is threatening to destabilize the delicate void of the micro-universe they’re trapped in, causing everything to be drawn in tighter and tighter.