BEST BETS
• Two characters — and actors — from Arrow cross over to a new episode of The Flash, as Diggle and Lila come to Central City to alert Barry to the sinister King Shark’s escape. No one is safe from this villain. (CTV, CW 32 at 8; KTLA at 11) • Jimmy and Sara reunite as a couple, supposedly in name only, on a new Grandfathered. He agrees to pose as her beau at another ex-flame’s party, where he realizes he still may have deeper feelings for her. (City 44 , Fox 14 at 8:30) • Purely by accident on Alexis’ part, Johnny finds himself involved in the raw milk business on a new Schitt’s Creek. Elsewhere, Moira tries to connect with the locals, while David gives style advice to the competition. (CBC 20 at 9) • As the six-week social experiment comes to a close, the three sets of Atlanta newlyweds must decide whether to stay together or end their marriages in divorce in the season finale of Married at First Sight. (A&E at 9) • When he hears that retired Canadian Olympic champion sprinter Donovan Bailey (guest starring as himself) is coming to town, Gerry vows to seize this opportunity to settle an old score on a new Mr. D. (CBC 20 at 9:30) • The Bunce family confronts stakes that are higher than ever as they return for a new season of Jade Fever. If they continue to come up empty-handed, their Chinese investors are certain to withdraw their financing. (Discovery at 10)