Crash Course is an unofficial DuckTales 2017 comic strip written and drawn by Christine Ridgway. It was retweeted and canonized by Francisco Angones. The comic features the 2017 Continuum's version of Drake Mallard's Darkwing Duck, Launchpad McQuack and Della Duck, as well as a cameo by Gosalyn Mallard, who hadn't actually made her 2017 Continuum debut at the time.
Behind the scenes
This comic strip was posted on Twitter by artist and noted DuckTales 2017 fan Christine Ridgway, before being retweeted and therefore effectively canonized by Francisco Angones.