The Return / The Nemesis

S4, E101: Dad is in charge of getting the kids to their first day back at school on time, but he's overslept and now he can't find Gumball, Darwin, or Anais anywhere. He sets about retracing his steps from the day before to work out where they might be./Gumball and Darwin discover that Rob, who once swore to wreak vengeance on them, has been trying to destroy them for some time... but his traps never work. Taking pity on him, the kids make it their mission to help Rob become a better nemesis. But they do their job too well, creating a super-villain they may not be able to control...