Failsafe

"Failsafe" is the 16th episode of the first season of Young Justice, and the 16th of the overall series. It aired on November 4, 2011.

Logline
During an alien invasion, the Team faces the ultimate challenge when they are forced to replace the fallen Justice League!

Synopsis
A spaceship flies past the moon, and makes it way to Earth. As it approaches, Green Lanterns Hal Jordan and John Stewart investigate, with Batman in a spacecraft behind them. Stewart orders the spaceship to stop and shut down weapons, but it does not comply. It incinerates the two Lanterns instead. Batman deploys the backup - Superman, Captain Atom, Martian Manhunter and Captain Marvel. They too are killed. Batman narrowly escapes the destruction ray by jettisoning in an escape pod, but he is helpless as a smaller craft shoots him down as well.

Zatara informs Red Tornado of the disaster. Now that celestial defenses have failed, they organize the defense on the ground. Red Tornado leaves the Team, and tells them that should the Justice League fail to meet the threat, it will all be on their shoulders.

Iris West-Allen reports from Central City. Multiple alien jets have attacked the city, and kill several bystanders. Flash manages to whisk away Iris in time, and Zatara teleports cameraman Danny to safety. Iris thanks her husband, and the two heroes go off to save more civilians. They don't get far: on the next building, they are incinerated. Iris watches in horror. From the studio, Cat Grant cuts in, warning Iris that another ship is heading her way, but it's too late. She is killed as well. Cat moves to the feed from Taipei, where Hawkman, Hawkwoman, Green Arrow and Black Canary are incinerated as well.

In Smallville, Wonder Woman manages to destroy multiple spacecraft, but she cannot evade the incinerator ray. Red Tornado, the last surviving Leaguer, contacts the Cave. Moments later, he is destroyed as well. The Team watches on, determined to take up arms. Aqualad suggests a different strategy, as taking them head-on does not work. Robin checks global proliferation of the extraterrestrials, and finds one stray ship in the Arctic, near the Fortress of Solitude. Superboy is surprised Superman had a fortress, but now that he's gone, there'll be a lot he will never know about. Kid Flash vows to kill all aliens, but Artemis points him at the poignant fact that they have a Kryptonian and a Martian on their team.

The lone alien ship hovers outside the Fortress, seemingly unaware that Artemis and Miss Martian approach. Miss Martian telekinetically disables the ship's communication and propulsion systems, and Artemis covers the cockpit window with foam to blind the pilots. Aqualad attacks from underneath, and is saved from a direct hit from the gun by Superboy and Wolf. Robin analyses the cannon and orders Miss Martian and Superboy to detach it. But as Superboy pulls it off, a smaller blast forms up behind his back. Aqualad sees it, but before he can react, Wolf pushes Superboy out of the way and bears the full load of the shot. The Team is a bit dazed, but Superboy urges them on. With Miss Martian, be connects the cannon to the Bio-Ship. She has to decloak the ship for the transfusion to work, and at that moment, they are spotted by two more ships. Artemis manages to shoot down both, but the second craft's weapon is still functional, and hits Artemis. Miss Martian and Kid Flash scream in terror as she watches her teammate die. Aqualad destroys the ship.

In the Bio-Ship, the Team tries to cope with the loss of Artemis. Generally, everyone is silent, except Miss Martian, who cries, and Kid Flash, who is enraged. Aqualad pulls them together, and they set course for the Hall of Justice.

General Eiling leads a handful of soldiers against the alien invaders in front of the Capitol. Their tanks are destroyed, but as the three ships swoop in to finish the soldiers, the Team arrives. Superboy takes down one, the Bio-Ship shoots down the other two. They are greeted with cheers. Jason Bard thinks it's Superman, but David Reid remark that Superboy is too young, and lacks a cape. Eiling cuts in, and Aqualad formulates a plan: a counteroffensive with alien cannons.

They all regroup at the destroyed Hall of Justice. The Team is trying to come to grips with their mentors being really gone. Miss Martian cries at the statue of her uncle, but suddenly senses something. She lifts the statue, and finds Martian Manhunter under it. The Manhunter is dazed, and cannot remember how he got there. Miss Martian posits that perhaps he was density shifting when he was hit by the disintegration beam. Wally gets an epiphany: he detects Zeta-Beam radiation around the cannon. It doesn't disintegrate, it teleports. Everyone has to be still alive, somewhere. As they rejoice with the thought that everyone can be saved, more aliens converge on their location. The Bio-Ship is destroyed, and the feedback knocks out both Martians. Aqualad leads Eiling and his troops further into the Hall of Justice, to the teleporter. He wants the soldiers to go first, but Eiling overrules him—the world can't lose more heroes. Martian Manhunter clears each member individually, but as Kid Flash enters the tube, the aliens breach the room. Aqualad shoves him in, and with Superboy helps in the defense. Superboy manages to drag the wounded Jason Bard to the teleporter, and goes in after him. Eiling, Reid and many other soldiers are destroyed. Aqualad carries Martian Manhunter to the gate, and pushes him in. He is hit by the beams directly after.

At Mount Justice, Robin takes command. If people are being teleported instead of killed, they would have to be detained. The most likely location is the alien mothership, in Smallville. He needs Superboy to be the distraction. Miss Martian objects, but Robin rebuts her concerns. Aqualad would have sacrificed himself—and he did, so now they're without their leader. Superboy accepts; it's what Superman would do.

All around the worls, survivors tune in to a televised speech by the young heroes. In shelters in Happy Harbor and Gotham City, on the battlefield; everyone listens as the Team spreads a message of hope. Young heroes gather to take up arms against those who took their mentors.

Title
The title may have come from The Team being earth's last hope against the aliens, or the fact that J'onn was sent in to the simulation to shock Miss Martian back to reality as a "failsafe" after the exercise couldn't be stopped.

Cast and characters
! colspan="3"| Non-speaking roles
 * Stephanie Lemelin
 * colspan="2"| Artemis
 * Jesse McCartney
 * colspan="2"| Robin
 * Danica McKellar
 * colspan="2"| Miss Martian
 * rowspan="2" | Nolan North
 * colspan="2"| Superboy
 * colspan="2"| Zatara
 * Khary Payton
 * colspan="2"| Aqualad
 * Jason Spisak
 * colspan="2"| Kid Flash
 * rowspan="3"| Jeff Bennett
 * colspan="2"| Red Tornado
 * Wade Eiling
 * Jason Bard
 * Nicole Dubuc
 * colspan="2"| Iris West-Allen
 * Bruce Greenwood
 * colspan="2"| Batman
 * Masasa Moyo
 * colspan="2"| Cat Grant
 * rowspan="3"| Kevin Michael Richardson
 * colspan="2"| Martian Manhunter
 * David Reid
 * Green Lantern
 * Jason Bard
 * Nicole Dubuc
 * colspan="2"| Iris West-Allen
 * Bruce Greenwood
 * colspan="2"| Batman
 * Masasa Moyo
 * colspan="2"| Cat Grant
 * rowspan="3"| Kevin Michael Richardson
 * colspan="2"| Martian Manhunter
 * David Reid
 * Green Lantern
 * rowspan="3"| Kevin Michael Richardson
 * colspan="2"| Martian Manhunter
 * David Reid
 * Green Lantern
 * David Reid
 * Green Lantern
 * Green Lantern
 * Green Lantern
 * colspan="3" | Alfred Pennyworth
 * colspan="3" | Barbara Gordon
 * colspan="3" | Bette Kane
 * colspan="3" | Black Canary
 * colspan="3" | Captain Atom
 * colspan="3" | Captain Marvel
 * colspan="2" | Danny
 * colspan="3" | Flash
 * colspan="3" | Garth
 * colspan="3" | Green Arrow
 * colspan="3" | Hal Jordan
 * colspan="3" | Hawkman
 * colspan="3" | Hawkwoman
 * colspan="3" | Karen Beecher
 * colspan="3" | Lucas Carr
 * colspan="3" | Mal Duncan
 * colspan="3" | Marvin White
 * colspan="3" | Red Arrow
 * colspan="3" | Rocket
 * colspan="3" | Superman
 * colspan="3" | Tula
 * colspan="3" | Wendy Harris
 * colspan="3" | Wonder Woman
 * colspan="3" | Zatanna
 * colspan="3" | Hawkman
 * colspan="3" | Hawkwoman
 * colspan="3" | Karen Beecher
 * colspan="3" | Lucas Carr
 * colspan="3" | Mal Duncan
 * colspan="3" | Marvin White
 * colspan="3" | Red Arrow
 * colspan="3" | Rocket
 * colspan="3" | Superman
 * colspan="3" | Tula
 * colspan="3" | Wendy Harris
 * colspan="3" | Wonder Woman
 * colspan="3" | Zatanna
 * colspan="3" | Rocket
 * colspan="3" | Superman
 * colspan="3" | Tula
 * colspan="3" | Wendy Harris
 * colspan="3" | Wonder Woman
 * colspan="3" | Zatanna
 * colspan="3" | Wendy Harris
 * colspan="3" | Wonder Woman
 * colspan="3" | Zatanna
 * colspan="3" | Wonder Woman
 * colspan="3" | Zatanna
 * colspan="3" | Zatanna

Continuity

 * Kid Flash still has the cast after he broke his arm against the Injustice League in "Revelation", but now, he can wear it under a shirt.

Trivia

 * Main title scenes:
 * Red Tornado with the Team standing behind (01:23)
 * Miss Martian shouting (06:41)
 * Superman and Martian Manhunter getting disintegrated (01:00)
 * Red Tornado looks over an alien ship (03:34)
 * A raggedy American flag flapping (07:48)
 * USA army tanks get blown up (08:01)
 * Number 16:
 * This is the 16th episode.
 * The Team gets word that many heroes have fallen to alien invaders on October 16, 16:01 EDT.
 * The Team wakes up from their training simulation on October 16, 16:21 EDT.
 * This is one of two episodes that has shown Robin's skills as team leader, the other being "Homefront".
 * Wally said his own version of "Hello, Megan!" by shouting, "Hello, Wally!" which was noticed by Robin. Artemis said that to him in "Revelation".

Goofs

 * The number and position of stars on Wonder Woman's costume changes between shots.
 * At the Fortress of Solitude, Superboy's eyes are white/silver instead of light blue. This could have been due to the reflection of the white snow onto his eyes, making them appear as though they were silver.
 * The American flag has 48 instead of 50 stars.

Cultural references

 * The opening shot, of a spaceship's shadow gliding over the moon, is a reference to the opening scene of the 1996 movie Independence Day.

Unanswered questions

 * What are the limits of Miss Martian's powers, if there are any?
 * What do they plan to do to train Miss Martian's telepathy?
 * Does Miss Martian know how strong she is mentally?