Assimilation² (Doctor Who)

Doctor

 * Eleventh Doctor
 * Second Doctor (flashback)
 * Fifth Doctor (flashback)

Companion(s)

 * Amy Pond
 * Rory Williams
 * River Song
 * Jamie McCrimmon (flashback)
 * Peri Brown (flashback)

Featuring

 * Data
 * William Riker
 * Beverly Crusher
 * Geordi La Forge
 * Worf
 * Deanna Troi
 * James T. Kirk (flashback)
 * Spock (flashback)
 * Leonard McCoy (flashback)
 * Montgomery Scott (flashback)
 * Nyota Uhura (flashback)
 * Hikaru Sulu (flashback)
 * Pavel Chekov (flashback)

Enemies

 * Borg
 * Cybermen