did anyone read/watch the Magic School Bus series as a kid? And now watches Doctor Who?

Because clocketpatch has an absolutely brilliant crossover called Valerie for forgetfulness.

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In the SGA world thedeadparrot has Penis Envy, And Other Things Meredith McKay Doesn't Actually Have.

It takes the McShep relationship, adds the fandom favorite of genderbending, and tuns it on it's head. :)

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If you've got hours to kill cesperanza (or whatever you'd like to call her) has Written by the Victor's. It's a brilliant rendition of the break away from earth plot. and did I mention LONG. It's John/Rodney and John/Teyla. And OT4 if you squint sideways.

Also by cesperanza: With 6 You Get Eggroll (Due South, Fraser/RayK), 3 Lovers (SGA, OT4), and Snowed In (SGA/Due South). Essentially, read everything by this author.

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Tamora Peirce's Circle of Magic: Shifting Circles (Sandy/Briar, a bunch of other pairings. Action packed)

and Clear Skies (Tris/OMC, action packed again)