American Alien
Supergirl Season 4



Critic Ratings: 11
Critics Consensus

Refreshingly relevant, "American Alien" introduces an intimidating new villain without skimping on the social commentary.

Episode Info

In the Season 4 premiere, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James' impending indictment for acting as the vigilante Guardian, while Alex and Brainy struggle to get in sync at the DEO. Supergirl is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected.


Melissa Benoist
as Kara Danvers/Supergirl
Mehcad Brooks
as James Olsen
Chyler Leigh
as Alex Danvers
Jeremy Jordan
as Winslow "Winn" Schott
Calista Flockhart
as Cat Grant
David Harewood
as Hank Henshaw/J'onn J'onzz
Floriana Lima
as Maggie Sawyer
Katie McGrath
as Lena Luthor
Show More Cast

American Alien Photos

Critic Reviews for American Alien

"American Alien" feels like a culmination of where Supergirl has been headed for a long time.

Oct 14, 2018 | Rating: B+ | Full Review…

The jig is up!

Oct 14, 2018 | Full Review…

American Alien sets Supergirl's fourth season up on a nice direction with intriguing new villains, cast reshuffling and an overdue main plot thread.

Oct 15, 2018 | Rating: 8/10 | Full Review…

American Alien is far and away Supergirl's strongest premiere yet.

Oct 15, 2018 | Full Review…

It's refreshing to see Supergirl lean into its political themes, which feel more timely and compelling than ever.

Oct 15, 2018 | Full Review…

American Alien establishes a few new dynamics while also orienting viewers to where each character is three months after the events of the season 3 episode 23... There is a lot of potential set up on this episode, and much to be excited for.

Oct 16, 2018 | Rating: 4/5 | Full Review…

If a seemingly evil Supergirl emerges and begins using the same powers Supergirl has to wreak havoc, paranoid humans could begin to consider Supergirl an enemy as well. Kara is going to need all the help she can get in Season 4.

Oct 14, 2018 | Full Review…

"Alien lives matter" will undoubtedly be utilized as a slogan at some point this season as things get more political.

Oct 14, 2018 | Rating: 4.6/5 | Full Review…

Supergirl season four opens with a great episode that encapsulates so much of what the show does best that's both solid in its own right and sows the seeds of a season's worth of conflict.

Oct 14, 2018 | Rating: 4/5 | Full Review…

The episode was elevated by the performances.

Oct 15, 2018 | Rating: 3/5 | Full Review…

After a disappointing finish to a generally underwhelming Season 3, it's good to see Supergirl quickly bouncing back this week. "American Alien" sets the stage for a promising conflict to come.

Oct 14, 2018 | Rating: 8.6/10 | Full Review…