The ratings for the first half of Crisis on Earth-X are in and it looks as if they can't hold a candle to last year's Arrowverse crossover. Ever since Arrow spun out The Flash, the annual CW superhero crossover has been a steadily-escalating concept. The debut team-up in 2014 merely featured Oliver and Barry showing up on each other's shows, but the next year kicked off Legends of Tomorrow and introduced a story that required many more heroes to join forces.

Last year, Invasion! upped the ante and brought Supergirl into the mix, though her show barely impacted the crossover. Still, the 3-part adventure against the Dominators featured TV's biggest live-action superhero team-up and brought in some stellar ratings for The CW. Supergirl saw its best ratings ever and Arrow got its strongest numbers since the previous crossover. With Crisis on Earth-X properly bringing Supergirl the show into the action and pitting the heroes against their evil doppelgängers, The CW looked like it had a recipe for some massive numbers. Unfortunately, it seems parallel Earths don't stack up to alien invaders.

TV Line is reporting that last night's episode of Supergirl, the first part of Crisis on Earth-X, pulled in 2.65 million viewers and a 0.9 rating in the key demo. Arrow and the second part of the crossover, meanwhile, drew the same demo rating and 2.45M viewers. While the numbers were strong, they hardly matched last year's outing.

Crisis on Earth-X The CW

The Invasion! crossover last year saw Supergirl gain 3.5M viewers and a 1.1 rating, despite it only tying into the event in the final moments. Arrow, who celebrated its 100th episode during the crossover, pulled in 3.5M viewers and a 1.3 rating. Legends of Tomorrow posted similar numbers, and The Flash blew them all away with 4.2M viewers. All told, the numbers look to be some of The CW's best for the Arrowverse for the time being.

Tonight, The Flash and Legends of Tomorrow will bring with them the second half of Crisis on Earth-X. Though there's a chance the buzz from the first half will drive up their ratings, it seems highly unlikely the show's will top last year. Still, Arrow and Supergirl both saw their best demo rating since last year's crossover, so tonight's installments will likely top their respective bests.

As the trailer for Crisis on Earth-X parts 3 and 4 showed, there's still a lot left to get audiences excited. An even bigger team-up is on the way, featuring almost all of the heroes from the Arrowverse. Meanwhile, the mysteries laid out last night may receive answers and the new coupling of 'Lanvers' might continue to blossom. On top of all that, Earth-X heroes The Ray and Citizen Cold will make their debuts - possibly, just in time to help save the day.

MORE: Crisis On Earth-X May Have Introduced [Spoiler] at Barry & Iris’ Wedding

Crisis on Earth-X concludes tonight on The CW.

Source: TV Line