The announcements and media coverage for Hornets' Nest all describe Yates as the Fourth Doctor's companion, so I think adding him to the list is justified. 23skidoo 05:23, 3 August 2009 (UTC)
K9 Mark III Edit
Prior to switchover to new format, template maintained that K9 Mark III was a prose companion of the Fourth Doctor. What's the source of this?
Potential Additions Edit
Milena from Milena is overtly reffered to as a companion in her story, despite her brief tenure. Meanwhile, Miss Young from The Sea Devil also only has one appearance, but clearly serves the role of the companion -- with clear indication that the two have been having adventures for some time and that afterwards that it's back to the TARDIS! OS25 (talk to me, baby.) 19:55, August 24, 2015 (UTC)