Doctor Who stars enjoy adorable Comic Con rivalry

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This past weekend former Doctor Who stars David Tennant and Billie Piper (aka the 10th Doctor and Rose Tyler) made a rare joint appearance at a comic book convention in Philadelphia. Meanwhile, Matt Smith, Freema Agyeman, and Alex Kingston (aka the 11th Doctor, Martha Jones, and River Song) were busy attending their own convention in Australia. The true rival groups of Who-alums got into an adorable flame war that so far has spanned three videos and two continents.

First Tennant and Piper initiated the whole thing:

Then Smith, Agyeman, and Kingston raised the stakes from onstage:

And finally Tennant had this cheeky response:

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