I should’ve celebrated Halloween today with the 2009 Halloween special,The Waiters of Mars, when the Doctor decided to visit the finest restaurant on Mars.
That’s followed by @Tian’s favourite Doctor Who story, the timey-wimey masterpiece that is The Bend of Time - it’s so complicated that no one has been able to decipher what’s going on in it to this day!
Rinse of the Cybermen/The Rage of Steel: The Cybermen have a shower. It messes up their circuitry. They get angry.
Devolution of the Daleks - the Daleks turn to Kaleds again (why hasn’t this been done already?).
Or, alternatively:
Revolution of the Daleks - oh, it’s been done already!
Brad Night - Part of the Brad Wolf series.
Brain Gods - Self explanatory.
Mid Knight
In the Forest of the Knight
The Knight of the Doctor
Nicola Tesla’s Knight of Terror
Knight Terrors
There are so many genius additions to this already! 
The Doctor’s Wilfe
Daleks Bin Manhatten
Big Bangs
Kill them Moons
The Doctor Faills
The Moonbased
The Space Pie Rates
In Fern’s O
D-Gay of the Daleks
The Timed Monster
The Hedge of Destruction
The Chaise
The Weeb Planet
The Leisure Chive