Aired on: August 2, 2007

Ben and Gwen are forced by Grandpa Max to attend a wedding which means wearing clothes they don't like. However, this wedding is more important than it seems.

Tropes

• Abusive Parents: It is clear that Camille’s parents hate humans more than they love their daughter, given that they tried to kill the man she loves and her mother hits her without hesitation when she objected to it. They can also be interpreted as being emotionally abusive, given that they tried to sabotage the wedding while pretending to support it.
• All There in the Script: The Lenopans are never called by their proper species name. At most, Grandpa Max can only offer the info that the Plumbers refer to them as "sludge-puppies".
• Altar Diplomacy: Played With. Camille and Joel want to get married because they genuinely love each other. Their marriage ending the feud between their races is just a nice little bonus.
• Amazon Chaser: When Camille turns into her Lenopan form to fight her disruptive family, Joel says admiringly to himself, "She is going to be my wife".
• Beauty Equals Goodness: Camille, one of the few Lenopans who isn't evil, is a Cute Monster Girl. The evil members of her family are Blob Monsters. Partially Justified, as a flashback shows she initially took a similar form before shifting to be more humanoid when she got in a relationship with Joel, presumably to relate to him.
• Bitch in Sheep's Clothing: For most of the episode Camille's parents act supportive (or at least non-obstructive) of the couples while showing annoyance at the judgmental attitude of Joel's parents. Then it turns out Camille's parents are far more judgmental themselves and are the ones trying to stop the wedding.
• Body Horror: Gwen is pretty freaked out when one of the Lenopan guests approaches her, slightly vivisected and disfigured.
• Brick Joke: Early on Max says the suit Ben is going to wear to the wedding is a family heirloom. During the ending montage it's shown ripping because of Lucy's prank on Ben, with Max watching in horror.
• Bridezilla: Reconstructed, as Camille weaponizes her anger towards her family for actively ruining her wedding.
• Dating What Daddy Hates: Played with all over the episode.
  • Joel's parents are actively distrustful of Camille and her family and initially oppose the marriage. While they were correct about Camille's parents, they do apologize to Camille for not giving her the benefit of the doubt and bless their son's marriage to her.
  • Camille's parents play this straight, acting like they approve of the marriage but secretly despise the idea of their daughter getting married to a human to the point they try to sabotage the wedding. When that fails, they immediately decide to take matters into their own hands.
• Dramatic Irony: Camille's parents, annoyed at Heatblast, state that he must come from the groom's side of the family, unaware that he is in fact said groom's second cousin.
• Eye Am Watching You: Joel's dad does this to Camille's parents.
• Exact Words: Joel forbids his parents from carrying anymore weapons for the rest of the wedding. When Camille's parents begin disrupting the wedding, they lament not having their weapons, only for Max to give them weapons, stating that he made no such promise.
• Feuding Families: More like feuding races. The Plumbers and the Lenopans have been at each other's throats for many years, right up until the pact between them was formed.
• Foil: Both the bride and groom’s parents. While Gordon and Betty Jean openly disapprove of their son marrying Camille given the Plumbers past feud with the Lenopans, they eventually come around to accept their new daughter-in-law after she helps save them. Camille's parents on the other hand act they are supportive of the wedding, but are really trying to sabotage it, with the help of their daughter’s ex-boyfriend, and secretly dislike Joel and try to kill him before the two are married.
• A Form You Are Comfortable With: Being able to morph their outward appearances, the Lenopans take on human forms for the wedding.
• Foreshadowing: When Camille sees her ex-boyfriend, she asks how he found out about the wedding. It turns out he was hired by her parents to take the fall as the true saboteurs of the wedding to divert off suspicion from themselves.
• For Your Own Good: Camille's mother says this to her daughter when she tries to stop her family from attacking her groom and ruining her wedding, just before she hits Camille.
• Good-Times Montage: The ending of the episode shows a montage of all sorts of happy (and comical) memories being made at Camille and Joel's wedding.
• Hidden Disdain Reveal: Once Camille's parents reveal themselves to the true saboteurs of the wedding, reveal to they lied to Joel about liking him.
• Humans Are Ugly: How the Lenopans feel towards humans. This also makes them resent their human disguises even more.
• I Can't Dance: Ben may not show it, but he's self-conscious that he's never danced before. Gwen eventually teaches him how to dance, with very mixed results.
• I Lied: When Camille's parents attack everyone Joel expresses surprise since they said they liked him. This is the response Camille's dad gives.
• Internal Reveal: Camille's parents casually reveal Diamondhead's species are called Petrosapiens.
• Kick the Dog: Camille's mother delivers a brutal punch to her daughter at her wedding while her father attempts to kill Joel.
• Locked Out of the Loop: Lampshaded by Max, who apologizes to Ben and Gwen for failing to tell them both sooner that Joel and his parents were Plumbers like Max himself, and Camille and her family are sludge aliens called Lenopans (or as the Plumbers call them "sludge-puppies").
• Logical Weakness: Lenopans, being made out of a mud/sludge-like substance, can dissolve if they get submerged in a body of water, as shown when Camille's ex-boyfriend ended up in the hot tub. Intense heat can also dry them out and solidify them into a brittle mass, which made Heatblast the perfect alien to fight Camille's parents.
• Love Across Battlelines: During a battle between the Lenopans and the Plumbers, Camille and Joel bumped into each other and almost instantly fell in love with each other. A peace treaty was formed from their relationship.
• The Man Behind the Man: Camille's parents were bent on sabotaging the wedding from the start. Camille's ex-boyfriend was just a pawn in their game.
• Noble Bigot: In addition to the animosity shown to Lenopans, Joel's parents immediately assume that Ben (as Cannonbolt) is trying to sabotage the wedding, while they have weapons trained on him, and refuse to hear him, or Max who tries to defend Ben, out. While they weren't necessarily wrong to be distrustful of Camille's parents, they do acknowledge that they were unfair to Camille herself and apologize.
• Not so Dire: The episode opens with Grandpa Max struggling with something and telling his weakly protesting grandson to hold still while Gwen stands by looking concerned. It turns out he was putting a tie and suit on Ben.
• Perpetual Smiler: One hardly ever sees Lucy with anything but a sunny smile. The only exception is when she's fleeing the wedding in the face of Camille's parents getting aggressive.
• The Pollyanna: Lucy. Never mind that she hails from an alien race of mud creatures. She's a cheery ball of sunshine who's happy and excited about everything, and always has a smile on her face.
• Pop-Culture Pun Episode Title: The episode's titled after My Big Fat Greek Wedding.
• Properly Paranoid: Throughout the episode, Joel's parents are suspicious of Camille's parents, despite them acting friendly and supportive. Their suspicions are justified when it is revealed they are the ones behind the sabotage for the wedding.
• Psycho Ex-Girlfriend: Gender-reversed example; Camille has one, and he doesn't take it too well when he learns she's getting married.
• Rage Breaking Point: Ben becomes furious upon seeing Camille's mother hit her, and immediately transforms into Heatblast, intending to make the wedding crashers pay for what they've done.
• Retired Badass: Like Max, Joel's parents are retired Plumbers who still carry around their weapons.
• Shapeshifter Default Form: Lucy remains in human form throughout the episode.
• Taken for Granite: A variation; Ben defeats Camille's parents by using Heatblast to solidify their Blob Monster true forms into a pair of statues, which Camille jokes about using for a wedding cake topper. The creators would later confirm this was non-fatal and they were subsequently taken into custody.
• Troll: When Ben finally dances with Lucy, he does well... and then Lucy turns her feet back into mud, causing Ben to slip and fall, and laughs hysterically.
• Turn the Other Cheek: Camille is one to forgive her in-laws for being suspicious of her.
• Wedding Episode: The episode takes place roughly around Ben's cousin Joel's wedding. Hijinks ensues as wedding crashers in a form of mud-like aliens called Lenopans, which includes the bride's parents, wants to disrupt the wedding due to a long-time feud with the Plumbers.
• Wedding Smashers: Camille's parents enlist her ex to sabotage the wedding, taking action themselves during the ceremony after Ben defeated him the previous night. Interestingly, while they're opposed to the wedding itself due to Fantastic Racism, their reasons stem more from wanting to sabotage the peace treaty with the Plumbers that would be ratified by said wedding.
• What Happened to the Mouse?: It’s not clear whether the ex-boyfriend simply incapacitated the guy he shapeshifted into, or pulled a Kill and Replace on him.