Mario Kart 8 for the Wii U and Nintendo Switch was the first co-op project between L8RG8R2U and GreenCobrasGaming. The series ran from October 16th, 2017 to January 3rd, 2018.
You can watch the series from the beginning by clicking here.
"Cobra and G8R are racing their way through the grand prix with the occasional guest!"
- The majority of the series was played on the Wii U version, with the final few episodes being played on the Switch