During the recent Hollywood writers’ strike, Joss Whedon found the cure for all his sudden downtime. The man who gave us “Buffy the Vampire Slayer” and “Firefly” created a genre-busting musical about a mad doctor with a bad case of evil-mastermind-wannabe inferiority complex. And the only place to fill this prescription for cult horror-comedy? The Internet. Whedon, using his own money, called up some actor friends — including “How I Met Your Mother’s” Neil Patrick Harris — and shot on unused Universal Studios lots.
