PBS / Masterpiece 
All Creatures Great and Small ~ 

SEASON FINALE

9/8c

SUNDAY: In the moving Season 3 finale (with the traditional Christmas special airing next week), Britain declares war in September 1939, rattling the composure of the Yorkshire village where Siegfried (Samuel West), his brother Tristan (Callum Woodhouse) and newlywed James (Nicholas Ralph) share a veterinary practice. James especially feels the call to duty—“If I don’t put myself forward, who am I?” he worries to wife Helen (Rachel Shenton)—but first there’s a TB crisis at Helen’s family