Another May weekend, another deluge of season finales — though none are likely to blow the mind with as much daring, panache and imaginative fervor as BBC America's gloriously inventive Doctor Who (Saturday, 8/7c), which signs off until next time-travel with one of its trippiest yet emotionally powerful episodes to date. Steven Moffat's typically clever script, brimming with colorful incident and characters grandly heroic or villainous, finds a nifty way to salute the 50-year history of Doctors as we learn more about the impossibly irrepressible companion Clara (the smashing Jenna-Louise Coleman), first seen in a cosmic haze — "I don't know where I am ... Sometimes I think I'm everywhere at once" — with only one constant to guide her: "I have to save the Doctor." That same impulse prompts lizard lady Vastra, her wife Jenny and the stalwart Strax to summon Clara to a psychic conference call, interrupted by the menacing "Whisper Men" (reminiscent of the ghoulish Gentlemen from Buffy's classic "Hush" episode).
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