http://tvtropes.org/pmwiki/pmwiki.php/Recap/GuardiansOfTheGalaxy2015S3E26JustOneVictory
Synopsis:
“With the Nova Corps defeated and the fate of the entire universe in jeopardy, the Guardians must turn to an unlikely ally to stop The Serpent.”
Tropes featured in the episode:
- Back for the Finale: Thanos returns in this episode to assist the Guardians in their fight with The Serpent for the fate of the universe.
- Borrowed Catchphrase: Thanos borrows the Guardians' "A bit of both" and "You're welcome" quotes.
- Evil Versus Evil: Thanos faces off against The Serpent.
- Godzilla Threshold: With all other heroes occupied or captured by the Serpent, the Guardians are forced to call on Thanos to help free Asgard.
- Grand Finale: This is the last episode of the series.
- I Warned You: Thanos warned the Guardians of an impending doom for the galaxy and they will one day need his help to face it. That time happens in this episode and both the Guardians and Nova Corp hesitantly recruit him to take on the Serpent.
- Last Episode, New Character: The last character introduced in the series is none other than Peter's grandfather, who rails on him for not contacting him during his time on and off Earth.
- Throw the Dog a Bone: Though Loki still doesn't get hero recognition for his part in saving Asgard by Thor or Odin, the Guardians give him all of their medals as a token of thanks.
- The Worf Effect: Even Thanos proves no match for the Serpent and is through across space. In the end, he crash-lands onto Hela's homeworld.
