You know things are desperate when old enemies have to team up in a last-ditch effort to save the day. And sometimes, war makes strange bedfellows. But the best alliances of convenience are the ones where both sides can tell it'll end in horrible betrayal. What's your favorite alliance that's doomed from the start?

Please include a picture, poster, clip, piece of artwork, comics panel or book cover for your chosen alliance. And please mention the name of the series, the people who made the alliance, and why it was clear all along that it was never going to work. Thanks!

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Top image: The Doctor and the Master team up in Doctor Who, "Logopolis." Because the Master just sentenced the entire universe to death, and the Doctor needs his help to save it. The look on the Doctor's face as they shake hands is priceless.