We celebrate our landmark 100th episode by looking at two largely forgotten curios in new Who: David Tennant's and Matt Smith's guest appearances on The Sarah Jane Adventures! For Allison, it's a pair of all-new performances she's never seen before from the 10th and 11th Doctors, while Alasdair gets to have some fun with all the classic Who lore on display. What's it like when the Doctor is explicitly a guest star in somebody else's story? What does it sound like for the 11th Doctor to deliver Russell T. Davies-written lines? And just how charming is this this delightful little spin-off? All that and more as we complete our first 100 episodes and look forward to 100 more!

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