"Karen 2.0" premiered on Friday the 13th of April in 2012. The first time this happened was with "Friend or Foe" which aired on the exact same day in 2007. It was also on Friday the 13th that year too.
This marathon was similar to NEW NEW NEW NEW NEW Week in 2007, which premiered a new episode every weekday for two weeks. Unlike this latter, it had 11 minute episodes compared to 22 minute episodes.