The "Mind Share device" was a device built by Phineas and Ferb so that they and their friends could communicate with some aliens. However, it turned out to be a trap, and their minds were swapped with the aliens'. After this, the aliens' leader, Morg, told the rest to celebrate their freedom and to put the device to self-destruct. With the help of Candace, the kids managed to trick the aliens to swap their minds once again just before the device self-destructed.