Regenerations can go wrong sometimes. That's what they were taught in the academy, but in The Doctor's experience they never seemed to go right.
Each time she'd changed her body to avoid death something had happened. She'd have a bout of amnesia, fall into a coma, cause The TARDIS to crash - or all three. Now the time for regeneration was approaching her again and she decided to make preparations.
The Sisterhood of Karn had perfected the science of regeneration so The Doctor decided to pay them a visit. She knew they had elixirs which could trigger the process and give you control over who you would become - but The Doctor didn't want that. She didn't want to change at all.
When she told the members of the Sisterhood this they laughed at first, but when she pushed the matter they confessed there was a way to do it. They gave her an elixir from their deepest vaults, explaining it had been made by the very first Timelords. They knew it was supposed to redirect regeneration energy away from making the change during the process, allowing the user to keep their body but still heal. However, they didn't know where the energy would go.
That was several adventures ago, The Doctor had nearly forgotten the bottle of elixir she'd kept since in her interdimensionally deep pockets - until now. She'd just foiled her enemy, The Master's plans on Earth (where else) yet again. He was going to use an experimental reactor under Dubai to open a rift to another dimension. The Doctor had managed to trip The Master through the rift as it opened (no doubt, he'd be back some day) and was able to stop it growing bigger. Unfortunately there was only one way she could seal it - by absorbing the energy of the rift into her own body.
As she climbed back to the surface she could feel the radiation from the rift killing her, it was time to regenerate. She knew something like this would happen soon and was ready - she took a deep swig of the elixir and waited for the process to kick in. There was the sudden rush of energy enveloping her per usual - then... nothing.
The Doctor rushed to the nearest reflective surface, a mirrored window on the side of a nearby tower, to check herself. It had worked, she still looked the same! But something wasn't right. The Doctor realised the window she was looking in to study her reflection was on the second floor... no, the fourth - thirteenth! She was shooting up, bigger and bigger.
Of course, the regeneration energy had to go somewhere if it wasn't going to be used to change her, and the only nearby receptacle for that kind of energy was her body. The energy couldn't change her thanks to the elixir, so it had just made more of her - a lot more.
Her growth was finally coming to an end when she spotted the TARDIS by her feet. She picked up her tiny time machine and studied it. She was clearly too big to fit inside any more. Without being able to fit inside her transport, it looked like she was going to be stuck on Earth.
She was initially upset, she loved travelling through Time and Space. But she had to admit to herself, there were worse places to get stuck than Earth - she spent most of her time here anyway. And at her new size, stopping its constant invasions would be easier than ever. The Doctor felt a shiver of excitement at the prospect of being able to crush the tiny aliens and robots who made her life hell beneath her giant feet.
It was then The Doctor realised that this was her best regeneration ever.
Meta: I've made enough companions of The Doctor into Giantesses, its time for the lady herself to get big. With the whole 'bigger on the inside' thing, its always really tempting to make size-related stuff connected to The TARDIS in any Doctor-Who fanfic, but I thought it'd be fun to explore the possibilities regeneration had to offer - especially since Jodie's regeneration is coming up (how close did I get it to her final story?).
I wrote an alternative story at first focussed around the concept of the Time Lord Victorious. It was going to end on a line like "She knew the Time Lord Victorious was wrong, but the Time Lady Victorious felt so right." - lame, I know. The main reason I didn't go this route was because I felt you really have to know your Doctor Who for it to make sense - especially when I brought things like The Moment into it. So in the end I went with a (hopefully) simpler story. (I just really want to write for Doctor Who, can you tell?)
I got the idea for this shot from seeing a picture of Jodie holding a toy TARDIS in her hands and inspecting it. When I removed the background, Zyro also removed the toy which made it really easy to add something more realistic into her hands. There's a lot of shots of Doctor Who stars playing with toys of themselves and the TARDIS - its a really good source for collage material.
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