"Supergirl's" second season (and its first season on the CW) continues next week as the show makes subtle (and not so subtle) changes. Superman's around, Cat Grant's gone and the President of the United States is about to make her debut.

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Lynda Carter, known for her iconic portrayal of Wonder Woman in the '70s TV series, will debut as POTUS in next week's episode, which is titled "Welcome to Earth." The installment will see the DEO step up its game when it comes to aliens hiding on Earth -- and there are a lot of those, by the way. The trailer positions the episode as a bit of a political thriller, appropriate considering Carter's addition to the show as the president.

An attack is made on the President (guest star Lynda Carter) as hot-button, alien vs. human rights issues heat up in National City. Supergirl (Melissa Benoist) and the DEO are assigned to protect the President and bring in the responsible party. Alex (Chyler Leigh) teams up with Detective Maggie Sawyer (Floriana Lima) to investigate the case while Kara searches for a recently escaped Mon-El (Chris Wood), who she fears may be the alien behind the assault.

Starring Melissa Benoist as the Girl of Steel, "Supergirl" airs Mondays at 8 pm ET/PT on The CW. The series also stars David Harewood as Martian Manhunter, Mehcad Brooks as Jimmy Olsen, Chyler Leigh as Alex Danvers and Jeremy Jordan as Winn Schott and features appearances by Calista Flockhart's Cat Grant as well as Tyler Hoechlin's Superman.