Matthew McConaughey, Woody Harrelson

This week, True Detective fans speculated about how the HBO show would wrap up its first season and how the repeated references to the "Yellow King" would fit in — and a new videomakes a pretty convincing argument. After John Travolta butchered her name at the Oscars,Idina Menzel went on The Tonight Show Starring Jimmy Fallon to perform her Academy Award-winning song "Let It Go." Lena Dunham and Kate McKinnon teamed up for a series of promos about Dunham's upcoming gig hosting Saturday Night Live, while SNL cast memberSasheer Zamata was featured in the first episode of new web series Black Mad Men. Check out those clips and more in our weekly roundup of the best online videos:

Photos: The best SNL cast members of all time

True Detective Yellow King: If you've been wondering about what the "Yellow King" is going to turn out to be on HBO's True Detective, wonder no more. This video has all the answers you need:

Lena Dunham Saturday Night Live promos: We have high hopes for Girls star Lena Dunham's SNL hosting debut, and these hilarious promos with Kate McKinnon are only making us more excited for Saturday's episode.

Frozen cast reacts to "Adele Dazeem": Adele Dazeem, the Internet's newest meme, was sputtered into existence by John Travolta at Sunday's Academy Awards, when the actor tried (and failed) to say Idina Menzel's name while introducing her performance of "Let It Go" from the Pixar flick Frozen. In this short clip, the cast of Frozen reacts to Travolta's mispronunciation.

"Let It Go" on The Tonight ShowJimmy Fallon fared a little better with Menzel's name on The Tonight Show, where she performed "Let It Go" with Fallon and The Roots (using classroom instruments).

Black Mad MenCheck out "Hummus," the first episode of the parody web series "Black Mad Men," featuring new Saturday Night Live cast member Sasheer Zamata.

"Rollin' with Whoopi": The View co-host Whoopi Goldberg has launched her own web series, filmed during her morning commute with her makeup artist and hairdresser. Check out one of the episodes below, in which Goldberg offers her thoughts on potato chips. (viaTubefilter)

Morning show cooking gone wrong: Want to see a holiday cooking segment on a morning talk show go horribly wrong? Over the holidays, prankster Nick Prueher posed as "Chef Keith Guerke" and appeared on five morning shows in Wisconsin and Illinois, where he showed the hosts how to make meals from leftovers. But, since "Chef Keith" isn't actually a chef, some of the concoctions included a smoothie made from ham, pie and gravy, and a mashed potato ice cream cone. Watch one of the segments below:

"Whitlock": This web series is a gender-flipped version of Sherlock, featuring main character Sophie Whitlock and her assistant Fawn Watkins. (via Tubefilter)