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Starscream VS Rainbow Dash - S1-E17
Continuity mistake: Rainbow Dash catches Star Scream in a tornado and spins him around so fast in his jet form that you see one of his wings break off and fall away. He plummets to the ground and transforms into his robot form and begins to beg for his life. He suddenly has both wings again at this point.
Nightwing VS Daredevil (DC VS Marvel) - S5-E12
Nightwing: Hah, see you in Hell. (00:17:40)
Trivia: Ben and Chad have stated in the past that if they ever do a series finale, that the very last episode of Death Battle would be between the two hosts of the show, Wiz and Boomstick.