Doctor Who’s recent season finale ended with a surprising regeneration and a familiar face. After only two short seasons, Ncuti Gatwa’s time as Doctor Who has come to a (rather disappointing) end. Note: this post contains spoilers for this past weekend’s Doctor Who season finale.

In the climax of Saturday’s Finale of “ Doctor Who ” Series 14, Gatwa’s Doctor regenerates into Billie Piper, who previously played companion Rose Tyler in Series 1 (2005) and Series 2 (2006). She also made a brief appearance as Rose Tyler in Series 4 (2008) and was in the “Doctor Who” 50th anniversary special in 2013.

To the shock of fans, Ncuti Gatwa regenerated in Doctor Who's series finale yesterday, but the surprise face who replaced him in the TARDIS may not be what it seems.