Summaries

Synopsis

Twenty years after the events of the first film, Lloyd Christmas (Jim Carrey) has been committed at a mental institution ever since his doomed romance with Mary Swanson (aka "Mary Samsonite"). After a recent visit to Lloyd at the mental hospital, Harry Dunne (Jeff Daniels) realizes Lloyd played a prank on him and was committed only as a joke. Lloyd decides to leave with Harry and the duo head to their apartment. When they get there, Harry tells Lloyd about his medical issue: one of his kidneys is bad and he needs a donor soon.

The two decide to go to Harry's old home, but Harry cannot get a kidney from his parents since he was adopted, and they are incompatible. On their way out, Harry's dad gives him his mail that's been piling up since he moved out. One of them is a postcard from his old girlfriend Fraida Felcher dating from 1991. It says that she's pregnant and she needs Harry to call her. They figure that Harry now has a grown kid with a compatible kidney & decide to track it down.

The two track Fraida (Kathleen Turner) down at her family's funeral parlor. Fraida admits that she had a daughter named Fanny that she gave up for adoption. She wrote Fanny a letter, only for it to be sent back and noted to never contact her again. Fraida shows the two a picture of Fanny that she found online, Lloyd then instantly falls in love with Fanny after seeing the picture of her.

The duo decides to find Fanny, and they take a hearse from the parlor and drive to Maryland where Fanny now lives. Dr. Bernard Pinchelow and his wife Adele (Laurie Holden) are the adoptive parents of Fanny, who has taken up the new name Penny (Rachel Melvin). Penny is going to a KEN Convention in El Paso, Texas to give a speech on her father's life work and is also given a package to be given to one of the doctors at the convention. Penny ends up forgetting the package, along with her cell phone.

Adele is secretly trying to poison Bernard, with the help of her lover and the family's housekeeper Travis. After Harry and Lloyd arrive at the house, they inform the Pinchelows of their situation, at which point Bernard realizes Penny left the package, which he says is worth billions. Adele suggests that Harry and Lloyd deliver the package to Penny. So Adele and Travis can get the billions from the package, Travis accompanies the duo, but he becomes extremely annoyed with the duo's antics. While they are driving, Travis sets off a firecracker in the car that deafens Harry, and Lloyd very briefly. They stop the Hearse in the middle of the road. Travis attempts to shoot them, only for a freight train to plow into him and the Hearse, which Harry and Lloyd do not see. As the duo continue their journey, they stumble upon their old van. They take it for a ride, only for it to break on the road. They end up stealing a Zamboni. Adele hears of Travis's death from his twin brother Captain Lippencott, who agrees to help her kill Harry and Lloyd.

The duo makes it to El Paso for the KEN Convention. While there, Harry is mistaken for Bernard and the duo are invited for a seminar. Harry and Lloyd get into an argument when Harry realizes that Lloyd wants to get with Penny. Harry refuses to let Lloyd be in a relationship with Penny, and Lloyd is then escorted out of the convention due to not being on the attendance list. Lloyd then gets a call from Penny. They arrange a meeting at a fountain after he tells her that he's there with her dad. The two then head to a restaurant, where Lloyd deduces, he is the biological father of Penny, not Harry.

Adele arrives at the convention and exposes Harry as a fraud when she tells the heads of the convention that he is not her husband. Fraida also arrives and pulls the fire alarm, and everybody exits. Harry runs into Fraida and Penny, only for the moment to be ruined by Lippencott pulling a gun. They run into the bathroom to hide, but he and Adele follow them. After Lloyd arrives in the bathroom, Adele and Lippencott attempt to shoot them, but three cops bust in with a healthy-looking Bernard, who knew that Adele was trying to poison him. The package he gave Penny were just cupcakes for one of the convention heads. As Adele and Lippencott are arrested, Adele then turns her gun on Penny and shoots, but Harry jumps in front of the bullet and is severely injured.

Harry is rushed to the hospital, where he reveals that he was playing a prank on Lloyd about needing a kidney. Harry and Lloyd are told by Fraida that neither are Penny's father and that her biological father is a deceased high school friend of theirs named Pete Stainer (or "Pee Stain", as they called him). As the duo leave El Paso, they spot two beautiful women walking in their direction. They decide not to waste this opportunity, and they end up shoving both women into a bush as a joke. They run off and high-five each other.

In a post-credits scene, Harry and Lloyd are riding in the Zamboni, complaining that they got the wrong milkshakes (they are unknowingly drinking each other's). They toss them backwards and the shakes hit the truck of their old nemesis Sea Bass, who angrily chases the two. A poster for Dumb and Dumber For coming Summer 2034 suddenly appears with a camouflaged Lippencott walking out of the text. Later on, we see Harry and Lloyd travelling safe back home.