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.

Ncuti Gatwa's shock regeneration is followed by an even bigger surprise as the show welcomes back a popular star of TARDIS past. BEWARE! Spoilers ahead!

The Fifteenth Doctor's era introduced a two-year-long mystery that was never openly addressed, and now it could be too late to fix things.