Since its return in 2005 after a 16 year absence, many an Earthling have stepped inside the TARDIS to take a journey through all of space and time alongside the Doctor. But not all companions are created equal.
Behold, our official ranking of all the Doctor Who revival's companions, from worst to best...
Oh, Adam, you idiot. Lasting only two episodes in the TARDIS during the Ninth Doctor's season (Christopher Eccleston), the genius researcher proved too dumb for his own good, taking advantage information gleaned in the future for his own gain and becoming the first companion the Doctor ever forced to leave because of his behavior. At least he got that computer installed in his head to truly freak his mom out with when he returned home?
Rose's dopey boyfriend grew into a pretty badass alien hunter, but like most people we met during the time of Rose, he was a bit overshadowed by her love affair with the Doctor.
Before James Corden was carpooling all over Los Angeles with pop stars as the host of CBS' The Late, Late Show, he played lovable Craig Owens in a pair of episodes during the Eleventh Doctor's (Matt Smith) tenure. Perhaps the only person to get to call the Doctor his roommate on Earth, Craig was fun, but ultimately inconsequential to much of the Doctor's overall story.
Through no fault of her own, Martha got the short end of the stick with not much more to do than crush unrequitedly on the Doctor. It wasn't until she left the Doctor and switched to Torchwood that she really shined.
Rory died plenty during his time alongside the Eleventh Doctor with his eventual wife Amy Pond (Karen Gillan). He was always a bit overshadowed by Amy's relationship with the Doctor, but he grew to become a warrior in his own right. Plus, is there anything more romantic than when he voluntarily watched over Amy in stasis for 2,000 years?!
The mystery of the impossible girl who got stuck in the Doctor's timeline was cool, but she also faced the impossible task of following one of the most loved companions (and possibly TV characters) of all time. That was just unfair to her, because without Amy's legacy, Clara probably would have been one of our favorites.
A future companion of the Doctor's, River Song's sporadic appearances are always a delight. The reveal that she was actually born Melody Pond, the daughter of Rory and Amy, and was also the Eleventh Doctor's wife, wrinkled our brain a bit, but the character—and Alex Kingston's portrayal of her—is just so much fun. If only we got to spend more time with her...
Before he became the evil Malcolm Merlyn of the CW's DC universe, John Barrowman seduced pretty much anyone and everyone in the universe as the 51st century con man Jack Harkness, star of both Doctor Who and Torchwood. If you didn't fall a little bit in love with him, you clearly weren't watching the same shows we were.
Donna was unlike any companion before or since, and pretty much the last person you'd expect to save the entire world, but that's exactly what she did. The Doctor and Rose both described her as the most important woman to have ever existed, and she even got time lord powers of her own for a hot second. Unfortunately, she will never know how great she is since her memory had to be erased to keep her alive. We're not crying, you are!
The companion who kick-started the whole revival, Rose was instrumental as an audience surrogate, helping introduce new viewers to the long-established Doctor Who mythology after the show's 16 year absence. But she was so much more than that. In Billie Piper's hands, Rose proved herself to be ever the equal to the Doctor, falling in love with him in the process. One of the few companions to travel with more than one incarnation of the Doctor, her tragic separation from the Tenth Doctor (David Tennant) broke our hearts.
Amy Pond was the ultimate awkward-cool girl with the ultimate dork of a boyfriend, and she only got better as we learned how entwined her life was with the Doctor's without her ever realizing it, thanks to her connection to the crack in the universe. We'd probably wait 2,000 years for her, too.
PHOTOS: 18 Winners and Losers of the 2016 Fall TV Season