In the new film, Ed Helms stars as Rusty Griswold, the now adult son of Clark and Ellen Griswold (Chevy Chase and Beverly D'Angelo, respectively), who takes his own family on a road trip. Comedic hijinks ensue, much like the trips he took with his parents and sister as chronicled in 1983’s “National Lampoon’s Vacation” and its subsequent sequels. Christina Applegate plays Rusty’s wife, with Chase and D’Angelo making cameos.
Hemsworth will play the husband of Rusty’s sister Audrey, while Day will cameo as a rafting guide.
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Hemsworth recently reprised his role as Thor in “The Avengers: Age of Ultron.” Day soon will be seen in New Line’s comedy sequel “Horrible Bosses 2.”