For me and most Hardcore fans who have seen episodes from every Doctor (Episodes not Episode as in more than one) would agree either Ace or Sarah Jane are the greatest companions ever and we all have ACTUAL reasons for liking her as a Companion. Unlike Rose where the only positives about her is that she makes the Doctor happy but as a character herself, Rose is terribly written and developed
Not a Traveling Companion but he has appeared in more episodes then most other Companions and he was smashing and fun to watch. Perfectly casted as Nicholas Courtney who kicks ass with the role. He even helped the Doctor after his death by making the Doctor come to terms with reality and face his demise.
His Death was the saddest for me :(
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