7 August 2010,
Adam Baldwin has revealed that the character of Alex McHugh (Mekenna Melvin) will feature more heavily in the upcoming fourth season of the show. McHugh was first introduced in the third season of the show as the daughter of Baldwin's character, Colonel John Casey.

The actor told IGN: "I have a feeling we're going to find out a lot more about Alex. She has self-defence skills and that likely portends that she will somehow find her way into a mission or two." Baldwin admitted that he was pleased with the introduction of the character, since it allowed him to show a more sensitive side to the gruff Casey.

"There's obviously been a hole in his heart throughout the series and this [character] potentially will fill it," he explained. "I'm a family man in real life so it's fun for me to be able to delve into that." - Digitalspy.co.uk