Doctor Who: 10 Worst Things The Tenth Doctor Has Ever Done

After escaping from the Daleks and returning everyone else home, the Tenth Doctor is left with Donna. But, during the aforementioned creation of the Meta-Crisis Doctor with Donna, she has gained the partial mind of a Time Lord, something her body cannot take.

As a result, the Doctor is forced to wipe her mind, a painful experience removing all the time she spent in the TARDIS. However, that's not all. If Donna was to remember the events, Tennant warns that Donna's mind would burn up. But in the end, it turns out Donna's remembering saves her when the Master grafts himself into the mind of everyone else on Earth.

Ten and Donna are one of the strongest TARDIS pairs we have ever had, and to see it end like this really hurts. As her Grandfather Wilf says, Donna had a better life with the Doctor, and in the end forgets all the wonderful things she did. But as the Doctor tells Wilf and Sylvia, either way, there are still countless worlds saved because of Donna's time in the TARDIS.

We can't fully blame Ten for this, it was necessary to save Donna, but nevertheless still a horrific experience. This moment will never not be an emotional gut punch.