A place for fans of Clarissa Explains It All to watch, share, and discuss their favorite videos. The '90s Are All That on Nickelodeon: All That, Clarissa Explains It All, Kenan & Kel and More! Catch more Clarissa Explains It All clips on NickRewind! See the Clarissa Explains It All Clip That Predicted Cowboys and Aliens Melissa Joan Hart got her job on Clarissa Explains It All because she didn’t like New Kids on the Block. : #NickRewind GET MORE NICKREWIND: Like NickRewind: Follow NickRewind: NickRewind Instagram: Like All That: Follow All That: Like Nick: Follow Nick: Nick Instagram: Nick Snapchat: Nick Tumblr: Pin Nick: Visit the Official Site: Ge See the Clarissa Explains It All Clip That Predicted Cowboys and Aliens Clarissa Explains It All debuted in 1991 and quickly became a classic. this link is to an external site that may or may not meet accessibility guidelines. Subscribe for More: Watch More from NickRewind: All That on YouTube: Nickelodeon on YouTube: What’s On TV?