|First appearance||Castaways #13|
Panther was placed on the Castaways in the middle of a mission because Captain America had been killed. The mission was to end the superhero Civil War.
Panther and Iron Man got the leaders of both groups, that reality's version of Captain America and Iron Man, together and settle their differences. Iron Man liked Panther's ability to end missions without killing someone, which was the start of their friendship.