Tuesday’s Trope: Giant Space Flea From Nowhere
[Tuesday's Trope is a weekly department highlighting an amusing video game trope from TVTropes. Aggrogate is not affiliated with TVTropes.org in any way. All trope examples come from TVTropes and are shared via the Creative Commons license.]
Boss fights don't have to make sense. Sure, sometimes you'll fight a crime lord, an alien overlord, or an evil wizard that fits in with the narrative of the game you're playing, but just as often you're probably going to run across a mutant cake, a robot dinosaur, or a Giant Space Flea from Nowhere.
What is the Giant Space Flea from Nowhere? It's supposed to be the embodiment of all evil in the world. Some say its father was the main character's long-lost friend. Nobody believed it was real. Nobody ever saw it or knew anybody that ever worked directly for it, but to hear the cutscene tell it, anybody could have worked for it. You never knew. That was its power. The greatest trick the GSFN ever pulled was convincing the world it didn't exist. And like that, poof. It's gone.
The GSFN is any boss that just doesn't make sense. It appears out of nowhere, forces you to fight it, and then vanishes without a word. In some games, it turns out to be the final boss, just because the guy you were chasing the entire game didn't seem big or interesting enough. It just shows up, looking for a fight.
Examples of Giant Space Fleas from Nowhere include:

