Doctor Who Season 14 Episode 3, ‘Boom’, just introduced Varada Sethu, who will be playing the Doctor’s future companion — but not in the way you think.

While the TV show is still very much wrapped up in Ruby Sunday’s mysterious backstory, the third episode ofDoctor Who Season 14just brought Sethu into the fold as Ordained Anglican MarineMundy Flynn.

‘Boom’is one of thebest Doctor Who episodesSeason 14 has had to offer so far, and it also gave us a hint of what Sethu and Ncuti Gatwa’s dynamic could look like on screen. However, don’t assume that Mundy Flynn will be the one jumping into the TARDIS next.

In all likelihood, Sethu could return as another character all together, starting her companion adventures anew. This isn’t unusual for the series, as actors in the past have returned in different (often larger) roles. Freema Agyeman, Peter Capaldi, and Karen Gillan are examples of this, with all three having appeared in the show before returning later on as companions (or even the Doctor himself!).

As such, it can’t be guaranteed that Mundy is a future travelling buddy, especially since the‘Boom’ endinghas her staying behind with Splice, vowing to raise her after her father died earlier in the episode. What’s more,photos from the production of Season 15show Sethu looking very different to Mundy Flynn, implying it could be a new person entirely.

Initially, it was believed that Sethu would be replacing Millie Gibson, who currently plays Ruby Sunday, the Doctor’s companion with a cloudy past. However, it was later confirmed that Gibson would be staying on for at least another season, and that Ncuti Gatwa’s Fifteenth Doctor would have not one, buttwo companions going forward.

Related:

Related:

To keep up with all the latest, check out our guide toSusan Twistand all the theories surrounding her. You can also make sure you knowwhen the new episode of Doctor Who is out, and find outhow to watch Doctor Who Season 14wherever you are.

Jessica Cullen is a TV and Movies Writer on Dexerto’s UK team. She’s previously written for The Digital Fix, Cosmopolitan, Refinery29, Slate and more. Aside from being the residential Yellowstone expert, she also loves Westerns, ’90s action movies, and true crime. You can email her here: jessica.cullen@dexerto.com.