While on an offscreen adventure, Webby and Dewey get trapped in a Venetian Sacrificial Chamber. Its cogs are somewhat rusty, making it the titular "World's Longest Deathtrap"… but it will still most definitely crush them to death in a little while if they don't figure out a way to get out. Their friends passing above could provide some help, of course — but somehow, one by one, they all end up in the pit with Dewey and Webby…
Behind the scenes
The World's Longest Deathtrap was released in five parts on Disney Channel between May the 28th and June the 24th of 2018.