From possible proposals to pregnancies, here's what some of your favorite shows have planned

By Lanford Beard Tim StackSandra GonzalezDan SniersonBreia BrisseyLynette RiceMandi Bierly and Nuzhat Naoreen
April 26, 2013 at 04:00 AM EDT


Martha Plimpton, T.R. Knight, Denis O’Hare, Ana Gasteyer, Estelle Parsons, and NYC mayor Michael Bloomberg all guest-star, but it’s returning fan favorite Colin Sweeney (Dylan Baker) who plays a pivotal role in the season 4 ender. Meanwhile, Cary’s (Matt Czuchry) plans to start his own firm mean big changes for Alicia (Julianna Margulies) and everyone else at Lockhart/Gardner — building to one colossal cliff-hanger. ”It’s a giant risk,” says Czuchry. ”I think that it changes the show in a very, very big way.” (April 28 at 9 p.m., CBS)


Prepare to Gleek out: In the season finale, Blaine (Darren Criss) visits a jewelry store to check out bling for his ex, Kurt (Chris Colfer). The McKinley High senior will get some ring (and love-life) advice from guest star Patty Duke, playing a salesclerk and one half of a lesbian couple (the other is Meredith Baxter) who befriend Blaine and Kurt. The question remains: Will Blaine propose? (May 9 at 9 p.m., Fox)


Walden (Ashton Kutcher) meets a drunk party girl named Stacey (Hilary Duff) who tries to bed him, but he (remarkably) declines. Why? Because he’s got eyes for her well-traveled, cultured, and extremely attractive grandmother (Marilu Henner). That leaves him in a pickle, though: The only way to get to Grandmama is to go out with her granddaughter. (May 9 at 8:30 p.m., CBS)


Ready to meet the woman behind the detective? On May 9, fans will get a glimpse of Sherlock’s former flame Irene Adler (Game of Thrones‘ Natalie Dormer), who will appear in flashbacks for the remainder of the season. ”When Sherlock‘s on Moriarty’s trail, he can’t help but think about Irene’s death,” says exec producer Robert Doherty. It all leads to a season-ending showdown between Holmes (Jonny Lee Miller), Watson (Lucy Liu), and, yes, Moriarty, which Doherty promises will be ”a proper head-to-head.” (May 16 at 9 p.m., CBS)


Leslie Knope (Amy Poehler) will face one of her toughest challenges yet as she wraps up her first year on the city council. ”She channels Reagan and asks the public, ‘Are you better off now than you were a year ago?”’ explains EP Michael Schur. ”She expects to be showered with praise. It doesn’t quite work out that way.” Also: ”Someone finds a piece of evidence that suggests that someone is pregnant.” (May 2 at 9:30 p.m., NBC)


Some personal curveballs rock Juliette’s world leading up to this freshman drama’s season finale, and Hayden Panettiere’s character ”ends up learning the hardest lessons about the choices that she’s made,” teases exec producer Callie Khouri. The tango will continue between Deacon (Charles Esten) and Rayna (Connie Britton), and by finale’s end Rayna winds up ”in a place she could not have foreseen.” (May 22 at 10 p.m., ABC)


After ghosts begin to slip through the veil that separates supernatural purgatory from the living in the May 9 penultimate episode, we’ll find out in the season 4 finale if Silas’ plan to drop the veil completely is successful. We’ll also learn who takes the cure for vampirism — a decision that EP Julie Plec admits she changed halfway through the season. And expect an emotional graduation day. ”I cried some really beautiful sad tears,” she says, ”and I cried some great happy tears.” (May 16 at 8 p.m., The CW)


Exec producer Kevin Wade compares the season’s final two episodes to a Western, with the Reagan clan — led by Tom Selleck’s NYPD commissioner — ”trying to bring the law to a [”place”] that’s been lawless.” In this case, that’s a low-income housing project controlled by gangs. Over the last two eps, one familiar character will be murdered and another will be severely wounded. (May 10 at 10 p.m., CBS)


Now that we know why the power went out, the final episodes of the season will find our heroes on two separate quests. On one end, we have Rachel (Elizabeth Mitchell) and Aaron (Zak Orth) trying to turn the power back on, while the rest of the group works to defeat dictator Monroe (David Lyons) once and for all. Exec producer Eric Kripke says the plotlines converge for a twist that is so major, ”even I, who have done cliff-hangers involving the apocalypse [on Supernatural], look at it and go, ‘Wow. That’s big.”’ (June 3 at 10 p.m., NBC)


Where do Jess (Zooey Deschanel) and Nick (Jake Johnson) stand — or fall, as the case may be — after the show’s finale? That’s the will-they-or-won’t-they roommates’ dilemma during the traditional Indian wedding of Jess’ bestie, Cece (Hannah Simone). ”Weddings bring out a lot of emotions,” says showrunner Liz Meriwether, and the ceremony ”brings to a head a lot of issues.” Not helping: Cece’s ex Schmidt (Max Greenfield) hatches a sabotage scheme, enlisting famously failed prankster Winston (Lamorne Morris). Jokes Meriwether, ”This is [Winston’s] masterpiece.” (May 14 at 9 p.m., Fox)


After spending most of the season in a ”honeymoon period,” Castle (Nathan Fillion) and Beckett (Stana Katic) are going to tackle some tough emotional questions in the season 5 finale, according to executive producer Andrew Marlowe. ”Some complications come in from outside their relationship that are going to force them to deal with where they are, who they are, and what’s next for them both,” he teases. (May 13 at 10 p.m., ABC)