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.

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.

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!