The episode, titled "Medusa," scored a solid 1.1 rating in the core 18-49 demographic, and was watched by 3.51 million viewers in total. That an uptick from last week's episode of Supergirl that puts the ratings for "Medusa" on par with the second season premiere of Supergirl.
Last night's Supergirl only just set off the crossover television event. The bulk of the episode was a standard continuation of Supergirl's story, with just the end leading into the crossover story that will continue through tonight's episode of The Flash, the 100th episode of Arrow on Wednesday, and Thursday's episode of DC's Legends of Tomorrow.
Also airing last night was Gotham's midseason finale episode on Fox, "Mad City: Beware the Green-Eyed Monster." as well as the midseason finale of Lucifer, "Quid Pro Ho." Both performed solidly, with Gotham drawing a 1.1 rating and 3.65 million viewers, and Lucifer delivering a 1.2 and 4.4 million viewers.
NEXT: "Heroes Vs. Aliens" Crossover Review / Supergirl: "Medusa" Easter Eggs / The Flash, Arrow, Supergirl, Legends of Tomorrow Crossover Trailer / "Heroes vs. Aliens" Behind The Teams Featurette / First Look At The Dominators / Invasion! Crossover Promo Photos / Potential The Flash Spoiler Spotted On Set / Will Joe West Die During The Invasion! Crossover? / Enter To Win An Ultra-Rare Invasion! Crossover T-Shirt