Meeting up at the pool, the Doctor leads the surviving Rezzies, Kangs and Caretakers as they draw the line together on the 245th floor against the systematic cleansing of all life by Kroagnon and his robotic Cleaners.
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When Mel is attacked by the robot cleaners in the pool, she is clearly dragged under the water several times. However, after she escapes and emerges from the pool, the hair on top of her head is dry. See more
Attention all robotic cleaners. Attention all robotic cleaners. At last Kroagnon can leave the basement prison they trapped his bodiless brain in and return, in this borrowed body, to the corridors and lifts of his own creation. They buried me away because I wanted to stop them using the Towers, and now you and I will destroy them.