More like inhabitin'. He was usin' Croach's body to talk with us, and all Martians have nanotech that can heal them from just about anythin', cosmic beings included.

[He shows no signs of pity for V'Stalu, who he barely knew and was detrimental to the entire mission by his "watch, don't participate" philosophy.]

I mean alternate dimension. V'Stalu tried to get them to stop evil future Jim before comin' to us.