Close Encounter With a Dalek
Unwilling to break the laws of time and interfere with a "fixed point" in history, the Doctor informs Adelaide that he will leave the base on Mars. History has it that the base was destroyed in a mysterious explosion and Brooke and her crew were all killed. Reluctantly, the Doctor comments that she may have a story to tell, and Adelaide agrees. She says that when she was 10 years old, the sky had changed, as it was the moment when the Earth was snatched by the Daleks, and Adelaide says that she saw a Dalek float down to her window, and it saw her and just stared at her, then flew away. Adelaide says that she knew, someday, she would follow it into the stars. The Doctor informs her that this was the beginning of humanity's furthest exploration of space.
You Die Today
The crew plan to evacuate in an escape shuttle, and the Doctor breaks the news to Adelaide that she must die today, on Mars, if events are to unfold as they should. Adelaide begs him to help but the Doctor insists he cannot interfere, so Adelaide allows him to leave.
Escape from the Water Zombies
The date is 21 November 2059, and The Doctor is on Bowie Base One, the first human outpost on Mars. Base commander Adelaide Brooke discovers some of her crew have been infected with a mysterious life form which takes over the host body and causes it to gush copious amounts of water. The Doctor and Adelaid flee two water zombies on sonic enhanced Gadget, previously operated by Roman Groom from the central dome. Andy and Tarak, still infected, chase the Doctor, Adelaide and Gadget back to the central dome, but are unable to pursue them any further due to the hardinger seals in the central dome airlocks and are contained in the base's "bio-sphere" section while Maggie is secured in the medical wing. The Doctor, however, is worried about the doors and whether they can protect them from creatures with such power, making a chilling statement, "Water is patient, Adelaide, water just waits. It wears down the clifftops, the mountains, the whole of the world. Water always wins!"
Gadget to the rescue
The Doctor, realising they have one chance, uses Gadget to roll across the Mars landscape and bring the TARDIS to the base. As time runs out, Maggie continues to wail at the glacier, causing even more ice to crack, and the other infected personnel, Andy, Tarak, Roman and Steffi begin to scream as well, adding their efforts to the Flood's release. Just as the Flood begins to escape the glacier, the TARDIS materialises in the control room, and the survivors get inside. The nuclear device explodes, destroying the base and wiping out all the Flood creatures, the explosion unnoticeable from Mars' atmosphere.
The Last of The Time Lords
As Ed prepares the shuttle for take-off, Maggie infiltrates the shuttle and blasts water up the shaft into the pilot room, which cascades over Ed's arm, infecting him with the virus. However, just as the infection consumes him, and his eyes turn white-blue, Ed bids Adelaide, Yuri and Mia a final farewell, "See you later", and triggers the shuttle's self-destruct system, which traps the Flood on Mars but leaves the rest of the crew stranded with no means of escape. The Doctor, who narrowly avoids being caught in the blast, is inspired to fight back against time, as he realises that he is the last Time Lord, and returns to the base to save the crew.
The Time Lord victorious is wrong!
An adamant Adelaide returns home and commits suicide, reverting the changes that the Doctor has made to the timeline. The Doctor begins to walk away from her door, thinking all is well. He is grievously wrong. The windows of her house erupt with blue light as a single laser blast rings out. Adelaide is dead. The Doctor feels the course of history being re-written in his mind. His fond memories of reading about the Bowie Base One article are painted over and exchanged with the morbid amendments he engraved on history. Captain Adelaide Brooke has been robbed of her noble death on Mars, now a martyr who left her remains on Earth in the most disgraceful fashion. The two crew members he rescued will be spared an early demise and live fruitful lives, but they are somewhat emotionally damaged from their ordeal. And though Adelaide's granddaughter will still travel into space, she will bear more sorrow for her grandmother's senseless demise. The Doctor's spirit breaks.