Doctor Who's 6 Best One-Off Companions

Idris-doctorwho Since the good Doctor returned to our screens a trend has emerged that did not exist so much during the classic series. Frequent specials for Christmas and David Tennant€™s final year have led to an increase in the number of companions that only had one on-screen adventure with the Doctor. We have seen some incredible characters and some wonderful guest actors. Here I want to celebrate six of the best. Before I start allow me a moment to be geeky and explain the terms I used to define both 'one-off' and 'companion.€™ The people on this list have appeared as a new character in only one story (two-parters count as one) since 2005. They must have either set foot in the TARDIS or at least been invited in by the Doctor during that episode (in general his willingness to allow them into his world separates them from being just someone who is on his side during an adventure.) I assume that if you are reading this you have seen the episodes mentioned already. If you haven't there may be spoilers ahead. Ready? Let's Go...
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