Zoe: Big damn heroes, sir!
Mal: Ain't we just.
For instance, say that the poor Damsel in Distress is looking her fate dead in the face, and is seemingly resigned to it, because it seems that Nothing Can Save Us Now and then, boom! The heroes kick down the door and proceed to stomp the bad guys into the ground. Just in Time.
A Ragtag Bunch of Misfits will often have a Misfit Mobilization Moment before becoming the Big Damn Heroes. If they were busy with something else, but saw the crisis and dropped whatever they were doing in order to save the day, it's a case of Dudley Do-Right Stops to Help.
If the heroes just finished a training arc and show off new powers, it's Look What I Can Do Now!.
If this is done in an anticlimactic way, then it's a Deus ex Machina. When done right, it is a sure-fire way to get a Crowning Moment of Awesome, or why not, a Crowning Moment of Heartwarming. Sometimes a moment like this is used to introduce a heroic character.
Compare The Cavalry (it's the heroes saved in the nick of time), Contrived Coincidence, Bad Guys Do the Dirty Work (otherwise known as Big Damn Villains), Villainous Rescue (when the villains are like this trope), "Hell, Yes!" Moment.
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- It is said that King Arthur will return in England's hour of greatest need.
- The same is said about Dom Sebastião of Portugual. It's called Sebastianism.
- The Other Wiki has a page for this "folk-motif" called Sleeping King.
- Some Jews believe this of a coming Messiah. Christians believe in the Second Coming of Jesus.
- Muslims also believe in the Second Coming in way that invokes this trope; the big difference is that Jesus is just one of many Prophets, not the Big Good Himself. Instead of dying on the cross, he was spared and taken up to Heaven still alive as a miracle. In the last days, he is expected to return to Earth to help marshall the forces of Good and then die a mortal death in the final battle against Evil.
- Jesus' first coming is a double subversion of this trope. None of his disciples believed that he was going to die on the cross; they thought he would be mounting an army to take over the Romans.
- At the end of the second episode of Sequinox, Vivaldi shows up to power up the Sequinox girls as they're being beaten down by Antares in their first fight.