'Flash' Finale: 7 Season 2 — and 'Legends of Tomorrow' — Easter Eggs

The Flash S01 Finale 3 - H 2015
Diyah Pera/The CW

[Warning: Spoilers ahead for Tuesday's episode of The Flash, "Fast Enough."]

The CW superhero universe is ready for its next chapter.

In Tuesday's season finale of The Flash, Barry (Grant Gustin) decided to not to save his mother, Nora (Michelle Harrison), while Eddie (Rick Cosnett) chose to kill himself so that his villainous descendant Eobard Thawne/Reverse-Flash (Tom Cavanagh) wouldn't be born. While there was plenty of action to keep viewers busy, the episode sneakily layered in plenty of teases for season two and the upcoming Arrow/Flash spinoff Legends of Tomorrow.

See more 'The Flash' EP on "Heartbreaking" Finale Death, Season 2 Speedsters and Villains

These are the big Easter eggs that will likely reverberate throughout the CW superhero universe. 

Meet Killer Frost

Barry saw his past, present and future while he was manipulating the speed force to travel back to the night of his mother's murder. Among the things he saw was his STAR Labs friend Caitlin (Danielle Panabaker) looking rather blue. In the comics, an accident transforms Caitlin into the frosty villain Killer Frost, who has the power to create and manipulate ice. She also has an insatiable appetite for heat, which she finds in the form of Firestorm (Robbie Amell), whom she is conveniently married to in the show. Panabaker has teased that she is looking forward to playing the villain, and the tease suggests that storyline will play a role in season two.

See more 'The Flash': Every Major DC Character on The CW Series       

Meet Cisco, metahuman

Eobard tells Cisco (Carlos Valdes) that the particle accelerator accident affected the young scientist, giving him powers. The proof? Cisco can remember the alternate timeline in which Eobard killed him. In the comics, Cisco is Vibe, a metahuman who can emit shockwaves so powerful that it can rupture the speed force. He becomes a member of the Justice League of America and in theory is powerful enough to harm the Flash. That all could come in handy if Captain Cold (Wentworth Miller) decides to bully Cisco in season two.

Who lost a helmet?

The winged helmet of Jay Garrick came through the wormhole, prompting Eobard to remark, "That's my cue to leave," suggesting that he knew who the helmet belonged to. In the comics, Jay Garrick was the first man to don the Flash identity, rocking a decidedly more old-school look. In the CW superhero universe, Barry is the first speedster, but it's possible Jay exists in an alternate universe the wormhole opened up access to. The producers have said they plan to introduce additional speedsters for season two, and it is looking like Jay might be among them.

Meet Barry Allen, convict

While in the speed force, Barry also caught a glimpse of himself in jail. Could Barry end up on the wrong side of the law in season two? Or is this simply a look at an alternate timeline? If Barry were in jail, he either is allowing himself to be incarcerated or he has somehow lost his super speed. In Arrow, Oliver (Stephen Amell) has spent some time behind bars, so perhaps it's time for Barry to follow suit. 

It's a bird, it's a plane — no, it's Hawkgirl!

Though she's already been teased in the first trailer for Legends of Tomorrow, Hawkgirl (Ciara Renee) made an appearance in the final moments of the finale, with her watching as the singularity begins to engulf the city. Also shown is her soon-to-be teammate Captain Cold looking on. Though he's a villain, the look on Captain Cold's face signals that he isn't excited for his city to be destroyed and hints that he just might have a heroic streak in him.

Rip Hunter gets a shoutout

The leader of the Legends of Tomorrow team is Rip Hunter (Arthur Darvill), a time traveler from the future who unites the team to battle immortal villain Vandal Savage. As Eobard climbs into his time machine, he remarks, "Rip Hunter would be impressed. He built the first one of these. Interesting man." 

The singularity

The Flash has opened the door to introducing the idea of the multiverse, a mainstay of DC comics in which alternate Earths (each with slight variations of its heroes) exist in separate universes. That could help explain Jay Garrick's helmet popping up. Eddie Thawne's body is sucked into the wormhole, while the episode ends with Barry attempting to shut down the singularity in the way that he previously stopped a tornado — by running in the opposite direction. Presumably he succeeds (there is a season two after all), but perhaps elements from the other worlds slip into Barry's world. That could potentially be the way a whole slew of new villains are introduced next year — as it's probably time for the show to put the particle accelerator accident behind it.

What other Easter eggs did you catch in the finale? Share your favorites in the comments, and stay tuned to The Live Feed during the offseason for updates on The Flash season two. For more from the episode, read our postmortem with executive producer Andrew Kreisberg.