Doctor Who: Every Companion Ranked Worst To Best

Medical student Martha Jones never really had much intention to join the Doctor in the beginning, and probably would have preferred to stay on Earth to complete her medical degree. Then again, she probably wasn't expecting to have her hospital transported up to the moon, with the Doctor needing her help to catch a blood-sucking alien. Then again, considering where that escapade led her, she'd probably be thankful for it.

Series 3 consisted of quite a few Doctor-lite episodes (Human Nature, The Family Of Blood, Last of the Time Lords), but it was never any problem simply because Martha was on hand to fill in the gap. Ruthlessly independent, insanely knowledgeable and more capable than many of the Doctor's previous companions, Martha was always quick to show anyone who doubted her that she had the skills to battle aliens whenever she needed to (case in point, Human Nature: an episode featuring the most bad-ass naming of bones in the hand that anyone has ever done).

Even with the Doctor incapacitated at the hands of the Master, Martha roamed the Earth for a solid year, gathering resistance fighters that were eventually able to give the Doctor the strength he needed to defeat the Master and end the regime that he had kept everyone on the planet controlled under. Martha was a strong character regardless of whether or not the Doctor was by her side, although when he was, the chemistry between the two was some of the best that has been seen in the new era of the show.

Martha was such a popular character, she even managed to spill over into other shows, featuring in the second season of Torchwood alongside Captain Jack. She was even meant to appear on The Sarah Jane Adventures before the show ended, further cementing her appeal with the fan-base as a whole.

Martha Jones. Gone too soon, but still able to make her mark as one of the best characters of New-Who.