The Doctor's rules

The Doctor's rules were a series of guidelines created by the Doctor for their companions. The Thirteenth Doctor admitted that her rules changed all the time, and noted that she found it especially important to lay down the rules with new companions. (TV: The Battle of Ranskoor Av Kolos)

As Jackson Lake, when he believed himself the Doctor, told his companion, Rosita: "The Doctor's companion does what the Doctor says."

- Jackson Lake

The Fourth Doctor's rules

 * 001: Do exactly what I say. (TV: The Ribos Operation)
 * 002: Stick close to me. (TV: The Ribos Operation)
 * 003: Let me do all the talking. (TV: The Ribos Operation)

The Seventh Doctor's rules

 * 001: I'm in charge. (TV: Dragonfire)
 * 002: I'm not the professor, I'm the Doctor. (TV: Dragonfire)
 * 003: "I'll think of that one by the time we get back to Perivale". (TV: Dragonfire)

The Ninth Doctor's rules

 * 001: Don't wander off. (TV: The Empty Child)

The Tenth Doctor's rules

 * 001: Don't wander off. (TV: The Girl in the Fireplace)
 * 010: Don't eat anything until you're sure it's totally safe. Unless it's a badly cooked kronkburger - in which case don't eat at all. (PROSE: The Price of Paradise)

The Eleventh Doctor's rules

 * 001: Don't wander off. (TV: The Eleventh Hour, The Rebel Flesh, Nightmare in Silver)
 * 001 [alternate]: The Doctor lies. (TV: The Big Bang, Let's Kill Hitler, The Wedding of River Song, The Angels Take Manhattan)
 * 001 [alternate]: There is always a plan. (COMIC: First Rule)
 * 007: Never run when you are scared. (TV: Let's Kill Hitler)
 * 008: Never ignore a coincidence. Unless you're busy, then always ignore a coincidence. (TV: The Pandorica Opens)
 * 027: Never knowingly be serious. (TV: Let's Kill Hitler)
 * 403: Always waste time when you don't have any. (TV: Let's Kill Hitler)
 * 408: Time is not the boss of you. (TV: The Time of Angels, Let's Kill Hitler)

The Twelfth Doctor's rules

 * 001: Use your enemies' power against them. (TV: Flatline)
 * 001 [alternate]: Don't be lasagna. (TV: Into the Dalek)
 * No being sick and no hanky-panky. (TV:  Kill the Moon)

The Thirteenth Doctor's rules

 * Never use guns. (TV: The Ghost Monument, The Battle of Ranskoor Av Kolos)