From the moment she arrives at the party, Trudy is looking for the Party Bug herself. She makes her way through the train, stopping students and characters of the make believe world alike to ask about her whereabouts. The Captain, she is told, is on the bridge. Of course. 

It doesn't take her very long to get there, and once she arrives, it's more or less what she was expecting. It's all delightful, to be honest, and she has to remind herself not to get distracted — is that a group playing spin the bottle? nevermind — as she continues her search. She unceremoniously shoves one of the alien characters (or maybe a freshman in costume, who knows? who cares?) out of the way to step towards the command seat.