Bear in Underwear (partially found animated pilot; 2015)
From The Lost Media Wiki
Bear in Underwear was a failed 12 minute pilot for Amazon Prime Video that premiered on June 26th, 2015 and was available on the service until September 25th of that year. The episode is based on a children's book by Todd H. Doodler and was produced by Amazon Studios. The pilot featured the voices of veteran voice actors Ben Diskin, Jess Harnell and Kath Soucie.
Most of the pilot is lost. However, three short scenes are available on Amazon's YouTube page.