******TARDIS-SIZED SPOILERS!****** Actor Ncuti Gatwa blasted his way into Doctor Who lore following his pioneering ‘bi-generation’ from David Tennant‘s resurrected Doctor in “The Giggle,” the last of several Doctor Who specials from 2023. The returning Tennant’s three specials and Gatwa’s introduction marked the returns of producer Russell T. Davies, Donna Noble (Catherine Tate) and classic…