[neatoman]

Zog wasn't really changed much from how he was in the comic, though they did actually explain where he came from, there he thinks he's part of scouting party but it's not clear why he's on earth in particular. A bigger difference is that in the comic the Turtles don't show much empathy until he dies and mostly just treated him like a convenient piece of muscle, here they at least fix his breathing mask, showing some level of compassion.