[Warning: The below contains MAJOR spoilers for Doctor Who Season 1 Episode 7 “The Legend of Ruby Sunday.”] Doctor Who digs deep for the MAJOR reveal we’d been waiting all season for as “the one who waits” has been teased (since the 60th anniversary specials !) and Susan Twist has been appearing as different characters every episode. Bonnie Langford is right when she tells TV Insider that this is “exciting and exhilarating and all those things”—there’s no other way to describe it! The latest Twist character is in the present day, under investigation by UNIT, bringing Jemma Redgrave , Langford, and Yasmin Finney back as Kate Lethbridge-Stewart, Mel Bush (who’s undercover), and Rose Noble, and introducing Lenny Rush as Morris.

The most substantial of Twist’s characters, Susan Triad, runs S Triad Technology—and it looks like the name of the company is an anagram of TARDIS. Furthermore, with her name the same as the Doctor’s ( Ncuti Gatwa ) granddaughter ..

. could this entrepreneur (of whom UNIT’s research has produced nothing) be that Susan regenerated? Kate questions why this is the first time she’s hearing about him having a granddaughter, and the Doctor admits his concerns about ruining her. But he knows he’ll recognize her if he looks her in the eye.

Mel returns to UNIT, reunites with the Doctor (we love how joyous him seeing both Mel and Rose again is) and reports that the daily sample says that Susan is human. But Kate has a theory that she .