Sarah Jane is up to something. The kids get sick of her lying and sneaking around, so they follow her. Expecting something to do with aliens, they are shocked to see her on a date! Her boyfriend Peter Dalton soon pops the question. Clyde and Rani are naturally suspicious, and start investigating him. When they discover that his house is unlived in, Sarah Jane is unfazed. In fact, she's acting downright weird, waving off their suspicions and even deactivating Mr. Smith.

The day of the wedding arrives. Clyde smuggles K-9 into the chapel. Everything seems to be going smoothly, when guess [[IncrediblyLamePun who]] crashes the wedding?

Turns out it's all a ploy by the Trickster, who gave a dying Peter a second chance at life and even love, in order to get Sarah Jane to forget about fighting aliens. The ring is a brainwashing device, and Sarah Jane's "I do" would have sealed the deal. The Trickster traps the Doctor, Luke, Rani, and Clyde JustOneSecondOutOfSync with the rest of the universe, and Sarah Jane and Peter JustOneSecondOutOfSync with them.

Even under threat of being trapped forever, Sarah Jane won't give in. In a HeroicSacrifice, Peter calls off the deal. Cue TearJerker ending.

----
!!Tropes

* AltarTheSpeed: Sarah Jane and Peter sure are in a rush to get married...
* BlatantLies: "Do not look at me. Everything is normal." -- K9
* {{Brainwashed}}: Sarah Jane, once again.
* ContinuityNod: Sarah Jane jokes about sending the Doctor's wedding invitation to Metebelis Three.
* {{Crossover}}
* DatePeepers: Luke, Rani, and Clyde
* DeadpanSnarker: Mr. Smith and K-9
* DecemberDecemberRomance
* FourthDateMarriage
* GoldDigger: Rani and Clyde suspect that Peter is one.
* AGoodNameForARockBand: The Pantheon of Discord, according to Clyde. The Doctor agrees.
* HeroicSacrifice
* JustOneSecondOutOfSync
* LameExcuse: Even K9 thinks Sarah Jane's excuses are pathetic.
* MindControlDevice: Sarah Jane's engagement ring. When things get just ''too'' weird, though, she has the willpower to take it off.
* ParentWithNewParamour: Unusually for this trope, Luke is enthusiastic about Sarah Jane's new beau, forbidding Clyde and Rani from ruining things.
* SheCleansUpNicely: In a completely non-romantic example, this is Luke's response to Rani and Sarah Jane all dolled up for the wedding.
* SpeakNowOrForeverHoldYourPeace: Obviously. Done by the Doctor himself, of all party crashers.
* TheMasqueradeWillKillYourDatingLife: Narrowly averted. Sarah Jane receives a package containing an alien life form at the same time Peter shows up at her house. Fortunately, Rani and Clyde are there to cover for her.
* WeddingDeadline: And the fate of Earth hangs in the balance.

----