According to Robot Chicken Wiki, the Kim Possible voice Kimpostor (Kim Possible was originally voiced by Christy Carlson Romano) is Rachael MacFarlane. The Kimprecise parody of Kim Jong-un was voiced by Randall Park. Almost a Kimpressive skit!
The wiki entry points out that Kim Possible somehow managed to slip through the hole she cut, despite the hole clearly being too small for her body. Yeah, what part of "Kim Possible can do anything!" did you not understand?