Over on his official Facebook fan page, Jason David Frank (aka the Green Power Ranger) posted this picture and may have accidentally let slip an unannounced guest:

JDF WHO

I'd recommend taking this with a grain of salt since Matt Smith has yet to be officially announced, but all of us "Doctor Who" fans had better start saving our pennies for a photo opp/autograph just in case.

We'll let you know when and if Matt Smith is confirmed, so keep an eye on BSR! to find out for sure! 

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Tags: jason david frank , salt lake comic con , doctor who , matt smith