Morty: Uh, what happened on Dorian 5?
Supernova: Nothing!
Alan: Nothing?! We exterminated a planet!
Morty: W-Wait, huh?
Supernova: Doomnomitron was hiding here! He's a shapeshifter! Destroying Dorian 5 was the only way to kill him!
Morty: Oh, o-okay. This again?
Rick: You know,  I could have made a device to detect Doomnomitron from orbit like  that.