10 Times Doctor Who Has Broken Its Own Rules
1. Killing A TARDIS
The TARDIS has been a constant companion to the Doctor throughout their travels, and unlike any other vehicle, this space and time machine is alive, sentient, and ever-evolving. 2021's Revolution of the Daleks seemed to forget this, however, when the Thirteenth Doctor quickly and uncaringly decided to kill one.
Recovered in 2020's The Timeless Children, this spare TARDIS was one of the only survivors of the newly-destroyed Gallifrey. This also made it one of the few TARDISes in known existence, if Clara and the Master's TARDIS were still in circulation. Despite knowing this, the Doctor used it to trap the Daleks she had carelessly summoned to Earth with an old hologram switcheroo... and then caused it to implode.
If trapping the Daleks inside one of the most powerful machines in the universe wasn't bad enough, heartlessly destroying it to sort out a problem she foolishly caused certainly is a cause for concern. Particularly seeing that the TARDIS is a sentient lifeform.
2011's The Doctor's Wife helped to humanise the Doctor's TARDIS, showing the audience that it is a sentient machine which deliberately intervenes throughout the Doctor's life. Episodes such as 2013's Journey to the Centre of the TARDIS reiterated the TARDIS' sentience, but the conclusion of Revolution seemingly forgot this and reverted the TARDIS to a mere vehicle for the Doctor to crash.
Breaking so many rules with either lazy, forgetful writing, or by suggesting the Doctor to be ignorant and heartless, this questionable moment raised a lot of eyebrows in the Doctor Who fanbase. It ultimately asked the question, 'Is there any rules Doctor Who won't break?'