Cosmo was in the first Guardians movie, he's in the Collector's museum. He's a telepathic Russian space dog in the comics, like Laika. I forget if he had telepathy before or after being lost in space, I assume after.

In the comics he was in charge of security on Knowhere, maybe in the MCU version she will have a similar role >!since they casually mentioned buying Knowhere!<

I was listening to the Always Sunny podcast, I'm not a super fan or anything, but I do love learning how the sausage is made so to speak.

At one point they were talking about a talent agent who sat down across from one of them and after a long awkward stare says to them "...BHB."

I forget who it was but after they kept saying they had no idea what BHB means the guy lets out "...Big Heads Book"