And here's the second part of my Top 50 companions of Doctor Who list where this segment at least has two on-off guest companions in the mix.
41: Mickey Smith (Noel Clarke)
Being the boyfriend of one companion (Rose Tyler) and the eventual husband of another (Martha Jones) might be something of an unique selling point but when Mickey Smith started off he was a bumbling, cowardly idiot of sorts. Of course that was mainly in his first episode and since then, he's grown nicely as a character, becoming more a hero than a zero throughout his time with both the Ninth and Tenth Doctors.
42: Ben Jackson (Michael Craze)
Well, who doesn't love a man in uniform, eh? This show has a knack for coming up with some great male/female companion team up with respective Doctors and for a small while, Ben was a brilliant addition along with Polly and both the First and Second Doctors as well. He's possibly one of the most underrated companions as well.
43: Grace Holloway (Daphne Ashbrook)
She might have only been in one movie and legal ramblings may have hindered her from being in any of the Big Finish productions (though Daphne herself has played another character) but long before Martha Jones appeared on the scene (and after Harry Sullivan of course), Grace was the perfect doctor for the Eighth Doctor in a movie that IMO is a lot better than other stories I can mention. Plus, she did start the whole companion kissing trend too.
44: Jackson Lake (David Morrissey)
If anyone could be the Doctor, then Jackson Lake certainly had the memories and potential to do it. The Next Doctor was something of a clever idea, nicely done around the time we knew the Tenth Doctor was heading towards his Eleventh incarnation and Morrissey played the role with a genuine heart and spirit in one of the show's best Christmas specials as well. He's also one of those one-off companions I wouldn't mind seeing have an adventure with another Doctor at some point too.
45: Canton Everett Delaware III (Mark Sheppard)
Another one-off companion of sorts, only this time around one from the Series 6 opening two-parter The Impossible Astronaut/Day Of The Moon (and keeping with Steven Moffat's love of timey wimey - we met the older version in 2011 before the younger one in 1969), Canton certainly made a great impression as he did his best to help the Eleventh Doctor, Amy, Rory and River defeat the Silence. Canton was also one of a few impressive LGBT companions/characters that we've seen within the series as well and he's definitely a character I wouldn't mind seeing one more time too.
Parts 3 and 4 of this countdown will be up next week. Hope you enjoy and let me know what you think of the rankings so far.