So Invincible is probably the most underrated book that Image produces. For us it's never been a big seller which is a shame cause it's such a great book. The concept is that young Mark Grayson is your typical teenager, just trying to get though school, relationships and well...his father is also the most powerful superhero on the planet (think superman). So what happens when Mark starts to develop powers...now he's gotta live up to expectations. It's very ultimate spider-man meets smallville but with the Image twist. So we see him dealing with alot more dangerous and twisted stuff that won't be seen in kid friendly books like spider-man and superman.
Be sure to check the book out in TPB or Hardcover when you get the chance! They just wrapped up a company wide crossover that is completely contained in issue #60 if you wanted a taste of what's going down.
Spoiler ALERT (stop reading if your already going to pick it up!):
Need more? well there's a twist in the first couple story arcs...he father is actually sent to conquer earth!!! and Invincible is not down with that so it leads to a very epic showdown between father and son!