Ncuti Gatwa had a specific goal during his time as the Fifteenth Doctor, but the writers failed to let him live out his biggest Doctor Who dream.

In the climax of Saturday’s Finale of “ Doctor Who ” Series 15, 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.

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.