If each doctor was in the 50th

Obviously Hartnell, Troughton and Pertwee would have to be played by someone else or footage from other episodes however what companion would be with each of the doctors and if there was an enemy to face each one what would it be?

1st Doctor- Susan (First companion, special to Doctor Who) and The Daleks.

2nd Doctor- Jamie McCrimmon (Most episodes for a companion ever) and The Cybermen

3rd Doctor- Jo Grant (Easy person to get and a great companion) and the Autons (in 2 of his stories not the Master because that will be explained later)

4th Doctor- Sarah Jane Smith or Romana (Depends obviously because of Lis Sladen being sadly deceased if they could get enough footage) and the Zygons

5th Doctor- Tegan Jovanka (Obvious Reasons) and the Black Guardian

6th Doctor- Peri Brown (Once Again Obvious Reasons) and Sil

7th Doctor- Ace (Once again obvious reasons) and the Rani

8th Doctor- Grace Holloway and The Master (Only enemy)

9th Doctor- Rose Tyler and the Gas Mask Zombies (Creepy, well known enemy)

10th Doctor- Donna Noble and the Judoon (Don't know why)

11th Doctor- Amy/Rory/River Song or Clara (Hard decision) and the Silence