When I was a kid I used to watch this show on Cartoon Network sometime between 2011 and 2014. After the show stopped airing, I have never seen it since. The show was about a couple of friends (maybe 3 of them?) who would encounter a dimensional being that they would have to deal with. One episode that I distinctly remember was about the friends going about their day (I think stuff went missing mysteriously, not sure though) but when the main character goes home, a giant (purple?) worm appears out of a rift that the worm tore into the dimension. I don’t remember how they dealt with it or what it did, but it simply just appeared from a rift and disappeared. Other episodes I sort of remember are where the friends are in a forest, hiding from something, and another one where their school is on a lockdown because some other anomaly terrorized them in the school.
I believe the group consisted of only two guys and a girl.