I teach English. My students had to write a text about a superhero. I did not play a role whether they wrote about a "real" superhero such as Batman or made up their own. A girl wrote the following: John came and saved her. That was his first mission, but several more missions and adventures of John followed. (That's the last sentence of the text.) I'd cross out the highlighted part (of John) since it is clear who is meant anyway. Apart from that, it sounds quite odd.