What are the names of the ninth Doctor's companions?

The 9th Doctor's (Christopher Eccleston) companion was mainly Rose Tyler, but he also traveled with Jack Harkness, and Adam Mitchell - but sent him back home when he greedily had an infospike put in his head in an attempt to gain knowledge of future, being the only companion to last only one trip with the Doctor, and never be seen again. Rose was sent to a parallel universe, but still eventually came back, and even though Jack died in the last episode of series 1, he was brough back to life, after Rose had looked into time itself and had the ability to do so, and when she did that, Jack was no longer able to die, and is why he was able to return throughout the series.