Latest "Arrow," "The Flash," "Supergirl," and "Legends of Tomorrow" crossover update reveals that Oliver Queen may have a hard time welcoming other superheroes in their team to battle the alien alliance.

The highly anticipated superhero collective this December surely brings a lot of attention among DC Comic and TV series fans. While it is entertaining to see these characters interact with each other, one particular superhero may keep his distance from them.

According to TVLine, Oliver Queen of "Arrow" may steer clear of interacting with other characters particularly with Kara, or more known as Supergirl. Executive Producer Andrew Kreisberg revealed that in addition to Miraku soldiers and the Lazarus Pit and magic and Damien Darkh, the flying aliens who can incinerate anyone with their eyes is "beyond the pale" for the Green Arrow.

The exec producer added that the events in "Invasion!" crossover will be too much for Oliver and keeping distance from Kara and other metahumans is "very Oliver thing to do." But this will certainly generate issues among superheroes especially with "Supergirl" and Barry "The Flash."  As per Kreisberg, "Kara sort of comments, 'Does he not like me?' and Barry's like, 'No, that's kind of how he treats everybody.'"

While this may sound not what everyone expects to see, TVLine suggests that Oliver's keeping an arm's length with everyone makes the upcoming crossover even more "exciting" and the team up "unprecedented."

Meanwhile, "The Flash", "Supergirl" musical will be graced by "Legends of Tomorrow" actor Victor Garber. iDigitalTimes reports that the Professor Stein half of Firestorm will sing a song or two in the anticipated musical crossover.

Exective Producer Greg Barlanti told Comicbook.com that he'd "be crazy not to" include Garber in "The Flash," "Supergirl" musical crossover. He added, "He's got one of the best voices."

Stay tuned for the latest on "Arrow," "The Flash," "Supergirl," and "Legends of Tomorrow" crossover.