Jon Stewart and Stephen Colbert are close friends who've collaborated on everything from the Daily Show to the Rally to Restore Sanity to a nerdy-as-hell lightsaber battle, but Stewart had never been a guest on the Colbert Report until last night.

Jon Stewart's Rosewater, the directorial debut that took him away from The Daily Show this summer and set the stage for the ascension of John Oliver, is finally out. And, because Stewart wanted to talk about his movie on the show, he recused himself as host and summoned Oliver back to the non-premium cable desk.

Deadline reports that Daily Show host Jon Stewart is taking the summer off to make a movie about an Iranian journalist Maziar Bahari, who was imprisoned after appearing in a Daily Show sketch. For eight of his 12 weeks off, Stewart will be replaced by regular John Oliver.