I'll echo what everyone else said, and say that these are really nice, especially for a first endeavour. One small detail I like is the way you do the episode numbers. I'm not sure if it's taken directly from somewhere, but it's very simple and stylish.
I do have one suggestion, specifically for the second comic:
I think it would look really good if the spaceship between the first and second panels actually came out in front of the panel divider. I think it looks a little bit awkward being split right down the middle like that, especially since it covers up most of the pilot and cuts into the cockpit, which is a big focal point for spaceships. I also think it would add some depth to the scene by creating the illusion of a foreground and background, and really accentuate the sheer scale of the scene compared to the single-panel vignettes of the other strips. It's a pretty epic scene for a four-panel strip, and it reminds me a lot of the Spaceman Spiff segments from Calvin & Hobbes.