10 Dumb Decisions In Doctor Who We Can't Forget

10. The Doctor Wiping Donna's Mind - Journey's End

The Tenth Doctor certainly did a lot of morally questionable things during his time on the show, especially towards the end of his run. One of the major themes often explored was how he needs human companions around to keep him from becoming a megalomaniacal god, as seen in The Waters of Mars.

But the decision to wipe Donna Noble's mind, a fan favourite companion, is put across as the only option he has in that situation. Through some complex science-fiction shenanigans, Donna has been imbued with the essence of a Time Lord, making her a hybrid of both the Doctor's race and her own.

The problem is that her human mind is unable to comprehend all of the new knowledge that has been poured into it and it's killing her. The Doctor decides that the only way to save her is to wipe her mind of all their adventures together.

This honestly ends up coming across as ludicrous that the Doctor couldn't think of another way to remove the Time Lord part of her without cruelly wiping her memories as well. There must be somewhere in the entire universe where this can be fixed in an afternoon or something.