Christopher Nolan's 'Interstellar': So Secret Matthew McConaughey Won't Tell His Wife What It's About

The 'Dallas Buyers Club' leading man reveals just how tight a set "Interstellar" director Christopher Nolan runs.

Toronto — In his two next films, Matthew McConaughey will journey from 1980s Texas through a wormhole into previously unknown parts of outer space. But a drastically different setting isn't the only difference between "Dallas Buyers Club" and the Christopher Nolan-helmed "Interstellar."

For one, "Dallas Buyers Club" tells the true story of Ron Woodruff, an HIV-diagnosed man who started smuggling in medication from all over the world to act as an alternative to the limited supply of meds legal in the United States. The wormhole-driven plot of "Interstellar" is so secret that McConaughey reveals he hasn't even told his wife, Brazilian model Camila Alves, about the film.

"I mean, ['Interstellar' is] a much more story-driven picture," McConaughey told MTV News' Josh Horowitz while promoting "Dallas Buyers Club" at the Toronto International Film Festival. "Dallas Buyers Club," which also stars Jared Leto and Jennifer Garner, is based on a true story, "Interstellar" sprang forth from the minds of Christopher Nolan and his brother, Jonathan.

The currently-filming "Interstellar" is operating under a level of secrecy that's become regular for the Nolan brothers' productions; the duo previously worked together on closing out the recent Batman trilogy, with "The Dark Knight" and "The Dark Knight Rises." Because of this secrecy, McConaughey had to remain quiet about specifics regarding the filming process, but did speak to Christopher Nolan's on-set presence.

"He knows what he wants," revealed McConaughey. "Oh yeah, he knows everything about what's happening on a film set, and what everybody's doing."

Fans will have to wait a while to find out all of McConaughey's "Interstellar" secrets; the film opens on November 7th, 2014. "Dallas Buyers Club," however, hits theaters this year on November 1st.