Unhappy Ending

Cue the Villain's Evil Laugh.

When no matter how hard the Hero fights in the Big Fight against the Villain, they still end up defeated. If present, the other good guys are horrified, the Hero's Love is distraught, and it's possible that the world ends because the Hero failed to protect it. This is usually where the story ends unless we get to see what happens after the Villain becomes a Successful Villain, which we hardly ever do unless an Unhappy Ending is really Sequel Bait for a new installment to the franchise.

Mirrors
Basic: The story ends on a bad note.

Reinforced: The story ends with the entire the Main Team killed by the Bad Guys. There is no possible hope for recovery of a loss this disastrous.

Downplayed: Though the Good Guys lost for now, there is still a chance for a later reversal to be done on their failure.

Negated: The Good Guys appear to have lost just to be saved by an Ex Machina. This can be through the classic Ex Machina (an ally arrives to Save The Day) or that the Hero's Latent Ability awakens.

Inverted: Happy Ending.

Justified: The Good Guys were exceptionally bad at their job throughout their whole journey. This is the moment they realized too late how horrible they were at being heroes.

Gleeful: What?

Dismal: In addition to Reinforced, the world ends now that the Villain has no one to oppose them.

Zip: The Savior arrives on the scene to avenge their fallen comrades. Knowing they're the last hope for good to win, they fight their hardest, but the Villain is too strong for them. Their defeat comes after the Main Team falls.