Brand reveals that a wormhole mysteriously appeared near Saturn 48 years earlier, opening a pathway to a distant galaxy with potentially habitable planets. Twelve volunteers traveled through it to assess each planet's suitability as humanity's new home, led by Dr. Mann (Damon). Volunteers Miller, Edmunds and Mann have sent back encouraging data from planets near a black hole called Gargantua. Brand recruits Cooper to pilot the spaceship Endurance to investigate further, while he works on "Plan A" â a gravitational theory for propulsion that would allow a mass exodus from Earth. The Endurance also carries 5,000 frozen embryos for the "Plan B" backup plan, which is to colonize a habitable planet to ensure humanity's survival. Cooper agrees to go, upsetting Murphy.