What it says. Let's see the AD&D stats you would give for different classic monsters and aliens from Doctor Who.
RPGPundit
The Kandyman
Frequency: Common
No. Appearing: 1
Armor Class: 4
Move: 9"
Hit Dice: 6
% in Lair: 20%
Treasure Type: D
No. of Attacks: 1
Damage/Attack: 1d6 or by weapon type
Special Attacks: Kandy, see below
Special Defenses: +1 or better weapon to hit
Intelligence: Exceptional
Alignment: Lawful Evil
Size: M
Psionic Ability: Nil
A few were in Spelljammer. Just in often very roundabout ways. I recall spotting what was probably a Cybermen homage and a Dalek. If they werent in Spelljammer then they were probably in Dragon.
Reskinning old 2e Gamma World monsters and robots would work too. GW androids or the Legion of Gold make for a viable Cybermen base for example.
Daleks could be done with say the Security bot. Formidible but not invincible. Just tinker the weapons loadouts.
Running a Dr Who themed campaign using Gamma World was discussed over on the GW list while it still existed. Using mutations and tech you could recreate many of the older icnic monsters and aliens.
Dr. Who was already statted in an official AD&D product... kind of. From the greatest module of all time, WG7 Castle Greyhawk:
(https://img.fae.ro/b22c16.png)