Sulfur hexafluoride is a gas that's several times heavier than air. When you inhale it, it leads to the exact opposite of helium voice: a deep, rumbling vocalization that sounds suspiciously like a record on slow speed.

As prophesied in the earlier preview for "Neil Patrick Harris' Puppet Dreams" web series, his Dr. Horrible co-star Nathan Fillion stopped by in a doctor's outfit in the newest episode to examine both NPH's puppet problem and his penis. And by penis we mean "the hammer." But of course by "the hammer" we still mean "penis."

Neil Patrick Harris suffers from a little-known, yet incredibly goofy ailment: He dreams almost entirely in puppets (including the sex dreams). In order to raise awareness of this horrible, ridiculous disease, NPH has a new series titled "Puppet Dreams," debuting on Nerdist's YouTube channel on November 27th; you can…

If you liked the Adventure Time episode where Neil Patrick Harris played the male counterpart to Princess Bubblegum, Prince Gumball, then the sequel is going to send you over the Moon. NPH is back as Prince Gumball in the episode "Bad Little Boy" — but also, Community's Donald Glover is playing Marshall Lee, the male…

What if Neil Patrick Harris and Felicia Day from the beloved Dr. Horrible series were pointy jawed anime creations? It could potentially look a lot like this! One clever fan recut Steins;Gate AMV so that the characters belt out Dr. Horrible's "Freeze Ray" ballad.

You'd better hope Joss Whedon gets around to filming Dr. Horrible 2 soon — or else Neil Patrick Harris may already have lost too much of his inner soul essence to those all-devouring blue plastic monstrosities. NPH is filming a sequel to last year's The Smurfs, and here's your first set photo. Looks like a wedding? Or…

Speaking of comebacks... Joss Whedon says that the long-awaited sequel to Dr. Horrible's Sing-Along Blog, his hit webseries from a couple years ago, could finally be on track soon.

While compiling our list of fan campaigns that saved TV shows, we stumbled across a group of Quantum Leap fanatics known as "The Leapers." And they ruled.

last night's episode of How I Met Your Mother, wild-eyed lothario Barney Stinson (Neil Patrick Harris) discovers that his girlfriend does not like Ewoks. Through an unlikely series of events, Barney ends up explaining his unified theory of Ewok fandom to a a college field trip. It doesn't make a lick of sense, but…

It's the awesome thing you didn't even know you desperately needed. Dr. Horrible himself, Neil Patrick Harris, guest stars in a special episode of Adventure Time next Monday — and now the show is Adventure Time with Fionna and Cake!