Slight alternation to that Knighthood episode with Marco would have been him packing some shit up to put away or to spend a few days home with his parents to help out after the birth of his sister and Star spends Act 1 and 2 of the story panicking that Marco is going away forever and act 3 is Marco not being sure if he's going to be around forever but promising to be Star's friend forever.
There time traveler trying to fix the past. I've given you the magic bullet to prevent World War 3. Use it wisely and send my check in the mail. I take gold only.