Info: I like the character of Martha Jones but there was at least one moment when I could have hated her. This takes off from that moment. Just a snippet of a story that will never happen.
"Oh, she was blonde, oh what a surprise!" Martha exclaimed almost angrily.
The Doctor whirled around, marched to her, grabbed her arm in an almost painful grip and began pulling her back towards the TARDIS, growling, "Right, that's it. You're done. I'm taking you home. Jack, c'mon."
The immortal followed meekly, remembering that it was the best course of action when the Time Lord was like this.
"I've been very understanding, Martha Jones," the Doctor was talking lowly, "it is after all, partly my fault you are infatuated with me. I haven't been the best, haven't been at my best, and I haven't meant to make you feel like a cheap knock-off." He yanked her rather roughly, growling, "And I've been ignoring your jealousy, because you are just human. I took you with me because I thought I saw something in you, I thought you were worthy. Not the first time I made that mistake, won't be the last."
They made it to the TARDIS, who was waiting with open doors and he shoved her through, "But the moment you make someone you've never met out to be a—a—"
"Bimbo?" Jack interjected tiredly as he closed the doors behind them.
"Yes, thank you Jack; the moment you made her out to a bimbo based on hair color alone is the moment I realized my mistake. Pack your things, take anything and I'll know, and hand over your key."
Fury played over the Doctor's face, a fury she had never seen directed at a friend.
"I don't expect all my Companions to get along," he continued, throwing switches and pulling levers at the controls, "but I do expect each of them to respect the others. Rose may've not had her A-levels, may have come off the estates and worked in a shop but she deserves respect. Just like the rest of them."
"She's the reason why I can't die," Jack put in, "hell, she's the reason the Doctor took me on board in the first place. She held the Heart of the TARDIS for about forty-five minutes and lived. She made me immortal, wiped out an entire fleet of Daleks, and saved the universe. She nearly gave her life for all that, would've if the Doctor hadn't died to save her. And that was the biggest thing she did, the biggest one I know of."
"Autons, Daleks, Me, Reapers, Gas-mask Zombies, Siltheen, Daleks, Bad Wolf, werewolf, Queen Victoria, the Wire, Cybermen, Isolus, Daleks and Cybermen," the Doctor said like a mad chant, "Pack your things, Doctor Martha Jones. You're dismissed from service as a Companion."
Martha squared her shoulders and tried to look the alien in the eyes. She couldn't. There was a darkness there, a madness almost unfathomable to mortals, and age beyond numbering.
She looked to Jack, hoping for help, for him to speak on her behalf.
He was leaning against a strut, arms crossed. There was a pity in his eyes and sympathy and pain. The pity was for her, the sympathy for the Doctor, and the pain his own. His eyes also had age to them, age and war and grief.
He did not speak, only shook his head sadly.
Martha steeled herself and nodded. She pulled the key from her pocket and handed it to Jack who nodded.
She also handed over her phone; Jack tossed it to the Doctor who de-supered it with a wave of the Sonic.
Silently, she marched to the room she had claimed only to find her baggage waiting outside a blank wall.
So the TARDIS was angry as well.
She felt them land.
Slinging her bags over herself, she marched back out.
Some part of her was expecting a ceremony or something, a drumming out or some sign of a dishonorable discharge.
Jack gave her back her phone and the Doctor spoke tiredly, "Don't try anything funny, Miss Jones, both Torchwood and UNIT will be watching and they will act. Do not contact any of my Companions unless the universe is in very real danger of being destroyed. They may contact you, but they probably won't. Do not lie to them. Do not search me out again. Do not approach the TARDIS again unless I or a senior Companion gives you permission. You will not receive any benefits you may have been eligible for had I not dismissed you; you will not receive the Companion pension or any grants you may have qualified for as a Companion. Do you understand, Martha Jones?"
"Yes sir." She agreed.
"If you breach these instructions you will be considered a danger and dealt with accordingly. Do you understand?"
"Yes sir."
"You are dismissed from service."
And so she exited the ship, hearing it disappear from behind her.