Red John strikes again on The Mentalist, Robin and Barney finally get hitched on How I Met Your Mother, Penny and Leonard (maybe) get separated on The Big Bang Theory, and the Criminal Minds crew braces for a tragedy — those are but a few of the big season finale plots in store on CBS’ dramas and comedies this May.

A complete tease-tastic rundown, courtesy of the Eye net’s PR department, is below. Warning: Major Spoilers!

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SUNDAY, APRIL 28

THE GOOD WIFE (9/8c)

On the night of Peter’s gubernatorial election, Alicia, Will and Diane race to emergency court proceedings when Zach believes he’s witnessed vote tampering. Meanwhile, Cary is approached by an unlikely source who offers to help him start his own firm, and Alicia’s conflicted personal and professional feelings come to a head. (Martha Plimpton, T.R. Knight, Denis O’Hare and New York City Mayor Michael Bloomberg guest star.)

THE MENTALIST (10/9c)

Just as Jane narrows down the Red John suspect list to seven, Red John strikes again, and the victim has a link to Jane’s past. (Laura San Giacomo guest stars.)

THURSDAY, MAY 9

TWO AND A HALF MEN (8:31/7:31c)

Walden dates a hot 22-year-old (Hilary Duff) but finds himself more interested in her grandmother (Marilu Henner). Meanwhile, Alan and Jake go on a father-son bonding trip.

PERSON OF INTEREST (9:01/8:01c)

When The Machine goes offline, Finch’s elusive original motivations for helping its irrelevant numbers begin to come to light as he and Reese join forces with surprising allies in the race to save it.

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FRIDAY, MAY 10

VEGAS (9/8c)

All bets are off when Sheriff Lamb, determined to get revenge, teams up with Savino to take down Porter Gainsley (Michael Ironside), the man who killed Lamb’s wife and attempted to murder Katherine. Meanwhile, Jack is devastated when he catches Mia in a compromising position.

BLUE BLOODS (10/9c)

When someone close to the Reagans is murdered, the family rallies together to take down the leader of the gang responsible. While Danny works on the gang leader’s girlfriend to lead them to him, Frank is left reeling from a second crisis.

MONDAY, MAY 13

HOW I MET YOUR MOTHER (8/7c)

As the gang prepares to go to Robin and Barney’s wedding, Ted invites Lily to see the house he’s finally finished fixing up. Meanwhile, Robin and Barney’s night of relaxation is ruined by an obnoxious couple (Casey Wilson and Keegan-Michael Key), and Marshall takes the baby on a last-minute trip to Minnesota to see his family.

2 BROKE GIRLS (9/8c)

Hoping to raise enough money for an upcoming business seminar, Max and Caroline deep-clean part of the diner for Han prior to a health inspection and discover something that could help re-launch their cupcake business.

TUESDAY, MAY 14

NCIS (8/7c)

The international manhunt for Eli David’s killer turns into a federal witch hunt against Gibbs and the team, which questions their unconventional methods and threatens their future at the agency.

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NCIS: LOS ANGELES (9/8c)

A nuclear explosion in the Pacific reignites the search for stolen nuclear weapons and prompts Hetty to shuffle the NCIS: LA partnerships, sending Callen and Kensi overseas and leaving Sam and Deeks teamed up state side.

GOLDEN BOY (10/9c)

When Clark is relegated to desk duty, he delves into Owen’s cold case in which the murder investigation of a construction worker was compromised by the events of 9/11. Meanwhile, Deputy Mayor Holbrook pulls a gun on Clark and Margot, Agnes drives away with her father, and Owen gets his long deserved promotion. Michael Madsen guest stars as Clark’s estranged father.

WEDNESDAY, MAY 15

CSI (10/9c)

Roles are reversed for Russell and his team as they are placed under the microscope when a feature journalist follows them as they investigate a series of murders. One team member goes undercover and is jeopardized when the team discovers they are up against a highly sophisticated predator. Plus: Look who’s guest-starring!

THURSDAY, MAY 16

THE BIG BANG THEORY (8/7c)

Sheldon and Penny are thrown for a loop when Leonard is offered an exciting job opportunity overseas.

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ELEMENTARY (9/8c; two-hour episode)

As Sherlock reels at the reappearance of his former lover, Irene Adler (Natalie Dormer), a series of flashbacks unravel the tumultuous events that led to his downfall into addiction. Meanwhile, he and Joan once again find themselves in the crosshairs of the enigmatic Moriarty.

MONDAY, MAY 20

RULES OF ENGAGEMENT (8:30/7:30c)

Brenda (Sara Rue) goes into labor on Jennifer and Adam’s wedding day, Russell and Timmy attempt a reconciliation and Audrey has a huge surprise for Jeff.

MIKE & MOLLY (9:30/8:30c)

When Peggy breaks up with Patrick (Gerald McRaney), Mike attempts to reunite them in order to improve his work life. Later, as a tornado descends on Chicago, Mike and Molly confess important news to each other.

HAWAII FIVE-0 (10/9c)

When a plane lands on Oahu with four bodies on board and a missing terrorist detainee, the CIA tasks Five-0 with finding him before he carries out an attack on U.S. soil. Meanwhile, Kono is on the run from the police for a murder she did not commit, and McGarrett’s prison visit to Wo Fat ends with a shocking discovery. Christine Lahti, Ian Anthony Dale, Daniel Henney and Autumn Reeser guest star.

WEDNESDAY, MAY 22

CRIMINAL MINDS (9/8c; two-hour episode)

The BAU’s pursuit of “The Replicator,” the UnSub that has been stalking the team all season, comes to a head when one of their own becomes a victim. Mark Hamill (Star Wars) guest stars.