To borrow Douglas Adams’ assessment, “Space is big. Really big.” Humans should really consider themselves lucky to spend their entire lives on a giant anchor, since anyone who manages to get lost in space would have a pretty difficult time getting found again. This, however, is exactly what happens to Dr. Ryan Stone (Sandra Bullock) in Alfonso Cuarón’s new space castaway thriller, Gravity, in which two astronauts’ decision to venture outside a space station leads to disaster when they’re hit by asteroid debris.

Back down on Earth, Joseph Gordon-Levitt (The Dark Knight Rises) has written and directed his first feature film, Don Jon, in which he plays a New Jersey gym rat and porn addict, who sees a possible end to his carefree and casual sex life when he meets Barbara (Scarlett Johansson), a beautiful woman with a penchant for the kind of romantic movies that Jon hates.

With the release dates for these two very different titles approaching, TV spots have debuted for both. In the teaser clip for Don Jon, shown above, the eponymous seducer gets quite hot and heavy with Barbara, before being left out in the cold to wait for a time when it will “mean something.” It’s probably not the outcome that he was looking for, but at least Jon will always have his faithful porn collection to go home to.

Gravity has two new TV spots, but like the trailers so far these glimpses don’t tell us much about the plot of Cuarón’s film before the initial accident. In many ways this is actually refreshing, since it’s become common for trailers to give away the entire plot of the movie they’re advertising. In these clips the focus is on showcasing the largely CGI-driven environment of life in space, and on the horror of coming untethered in the cold, unforgiving and infinite chasm of space.

It’s still difficult to grasp how Dr. Stone might possible survive this “fall,” since earlier trailers have shown that she ends up thousands of miles away from the space station within seconds. Cuarón will have to work hard in order to offer the audience some hope of salvation, whether in the form of a rescue by her mission partner Matt Kowalsky (George Clooney), or her own fast thinking. If she stays within the space station’s orbit path, it should actually come back around again within a couple of hours, but that’s a big “if.”

Two TV spots for a space thriller with a terrifying concept from the director of Children of Men, and one for a sexy rom-com from a first-time feature screenwriter and director who has acting since his childhood. If you caught the above clips whilst channel-hopping, which movie would you be most drawn to?

Gravity will open in regular theaters and selected 3D/IMAX screens around the U.S. on October 4th, 2013

Don Jon is out in US theaters on September 27th, 2013.