Second, when she is seeking information on Indigo/Brainiac, who takes her to the Fortress of Solitude? Jimmy does! I mean, really? Kara even says that Clark has asked her many times to come to the Fortress with him and she has turned him down. So why would she approach Jimmy and not Clark when she finally decides to go?
And most recently, while helping a trapped firefighter, Supergirl is exposed to red kryptonite. For those not familiar with Superman lore, red kryptonite is like a drug for Kryptonians, essentially making them act on their every whim. Imagine if you acted out all the bad thoughts you have every day. Basically they become total assholes. For example, spoiler alert: While under the influence of red kryptonite, Supergirl throws Cat Grant off of her high-rise office balcony (which if I worked for her I may have done without the influence of drugs or red kryptonite). So Supergirl goes bad, and Superman doesn't intervene? Seriously?
Don't get me wrong. I really like this show. I like the casting and all the nods to the comics and I think they are doing a great job of portraying the Superman/Supergirl universe in general. But I really just don't think they can go on much longer without the occasional Superman cameo and still remain believable as existing in a DC universe that has a Superman. I mean, hell, Flash and Arrow crossover at least twice every season and they aren't even related.
Speaking of, I'm very much looking forward to the Flash/Supergirl crossover. But that's also going to make things less believable if we don't see Superman soon. We have Supergirl, Flash, Green Arrow, Black Canary, Spartan, Overwatch (not to mention a vague mention by Oliver Queen of Watchtower), so we've got a little bit of an unofficial Justice League happening here. For that to happen, there will eventually have to be a Superman in the mix.
