Donna's Nobles travelled with the Tenth Doctor. They were attached to Donna (played by Catherine Tate) who was the most important companion ever.
Donna was a large-breasted loudmouth cow who became the Donna Doctor and REKT Dave Ross.
The Doctor wiped her memories to prevent her pressing rape charges against him. She returned to civilian life and married her granddad Wilf.
DONNA IS THE QUEEN.
Donna first shows up in the TARDIS right at the end of Doomsday as a teaser for The Runaway Bride. Ten manages to get rid of her after this story but she later returns for all of Series 4.
She also reappears in The End of Time.
Her run on the show was pretty decent and gave us all a break from the "Doctor and [Companion], sittin' in a tree, kay I ess ess I in gee!" bollocks that dragged down Tenninch's run.
SHE WAS THE FUCKING BEST EVER AND NOBODY CAN DENY IT.