Already Done for You/Playing With

Basic Trope: A Plot Twist where another character in the story has accomplished one of your mission objectives for you.
 * Straight: Bob and co arrives at the stronghold of The Dragon Captain Badd, only to find out that Aloof Ally Felicia has already offed him.
 * Exaggerated:
 * Bob and co arrives at The Very Definitely Final Dungeon to fight Emperor Evulz, only to find out that Aloof Ally Felicia has already offed him.
 * Every time you reach a Boss Battle, the other characters have already beaten it for you. When you reach one boss that makes a showy entrance, but is then mobbed by NPCs, you start thinking the game is just trying to annoy you.
 * Justified: Felicia need to get the MacGuffin that Badd/Evulz possess, which Bob and co also seek.
 * Inverted:
 * Felicia bites more than she can chew fighting a dragon, and drag Bob and co into helping her defeating said dragon when they pass nearby. Suddenly, Giant Space Flea From Nowhere!
 * Alternately: Bob and co defeated the enemy, then Felicia shows up stating she wanted to beat it and is told it's done already.
 * Subverted:
 * Badd gets up after Felicia fell him, and now fights Bob and co. Felicia escaped.
 * Alternately: because the MacGuffin Bob and co seek is now in Felicia's hand, the fight is now Bob and co versus Felicia.
 * Double Subverted:
 * Badd gets up, and promptly fall and dies from severe bleeding.
 * Alternately: Badd gets up and kills Felicia with a last shot before he dies. Bob and co escaped from the stronghold with the MacGuffin for zero effort.
 * Parodied: Bob and co never get to fight any boss, because Felicia offed them all.
 * Deconstructed: Bob and co never level up since Felicia gets all those humongous Experience Points from boss fights, leaving Bob and co underleveled.
 * Reconstructed: The Man Behind the Man sends The Dragon to delay the heroes in order to successfully escape, but Felicia manages to apprehend him while Bob and co fight The Dragon
 * Zig Zagged: Sometimes Felicia kill the bosses before Bob and co arrive, otherwise it's Bob and co's job to kill the bosses.
 * Averted: All bosses must be fought.
 * Enforced: "We need to show the players that this Felicia girl is awesome beyond Bob and co's league."
 * Lampshaded: "Well, at least that girl spare us the trouble offing this guy."
 * Invoked: Bob and co rushes through an underground passage filled with high-level monsters, hoping that this time Felicia will do the job defeating the high-level boss for them too.
 * Exploited: Bob and co drop hints about which bosses they plan to kill soon.
 * Defied: Bob and co spray Felicia with sleep gas before they go fight a boss.
 * Discussed: "You killed him? ...DAMMIT! I WANTED TO DO THAT!"
 * Conversed: "Oh hey, that stuck-up bitch Felicia acutally did something beside stand there and snark! That's nice."

Nothing to do here, because things are Already Done for You.