When Barry and co. traveled to Earth-2 on The Flash season 2, episode 13, “Welcome to Earth-2,” we got a glimpse of some interesting DC characters.

We know that there are multiple Earths in the world of The Flash, and when Barry, Cisco and Harry traveled to Earth-2, we got looks at characters that appear to be from other Earths or times — one of which we already know will be crossing over with The Flash.

Does this mean we’ll be seeing more of the others, or are they just Easter eggs — or some combination of the two?

Green Arrow

More specifically, this appears to be Connor Hawke, who we believe to be the Green Arrow of 2046. We’ll be meeting Connor on Legends of Tomorrow, alongside an aged Oliver Queen, who will be sporting his Dark Knight Returns look.

Though Connor Hawke is the son of Oliver Queen and Sandra Hawke in the comics, it has been confirmed that he will not be in the Arrow-verse. Rather, Connor appears to be a person of color, which likely means he isn’t Oliver’s son with another woman. Could he be Diggle’s son? He could also be a character with no attachment to the main characters.

1990s Flash

This one works on two levels. On the one hand, this shot of John Wesley Shipp’s Flash from the 1990 series pays homage to the original television Barry Allen (who currently plays Henry Allen). On the other hand, this implies that on another Earth, The Flash is actually Henry Allen; this isn’t out of the realm of possibility since on Earth-2, Robert Queen is The Hood.

Supergirl

In a clear set up for the upcoming Flash/Supergirl crossover, we got a glimpse of Supergirl flying through the skies of National City. This seems to indicate how the crossover is going to work: Supergirl is from another Earth that Barry will visit.

The crossover, which will take place on Supergirl, will be titled “Worlds Finest” and air on Monday, March 28 at 8:00 p.m. ET on CBS.

Legion of Superheroes ring

The Legion of Superheroes is a team of young superheroes from the 30th century. The Legion consists of members from various alien planets. The Legion protects members of the United Planets, which mostly comprises planets in the Milk Way galaxy.

The Legion of Superheroes was founded by Cosmic Boy, Lightning Lad and Saturn Girl when they stopped the attempted assassination of galactic billionaire R.J. Brande. Brande then went on to finance the Legion, and it would eventually expand to include other heroes.

Jonah Hex

We got our first look at sharpshooter Jonah Hex, who will be appearing in an upcoming episode of Legends of Tomorrow when the team visits the Old West. He is being played by Johnathon Schaech. The character description for Jonah Hex reads:

“A true legends of the Old West, a morally ambiguous gunslinger with a penchant for danger. Surprisingly, he knows a thing or two about time travel and the future, but is at home in the Wild West. He’s been battling outlaws and gangs for awhile now, and advises the team to be extra careful when they arrive in the small town of Salvation.”

Gorilla Grodd

We also got a look at Gorilla Grodd arriving at Gorilla City on Earth-2, which is where we last saw in in The Flash season 2, episode 7, “Gorilla Warfare.” This likely implies we’ll be seeing Grodd again. He is one of The Flash’s most infamous rogues, after all.

The Flash airs Tuesdays at 8:00 p.m. ET on The CW.