The Starred Alien version of Gory has much higher health and damage, along with more knockbacks, slightly longer range, and a Barrier with a breaking point of 6,000 damage.
General GreGory can make a dent in your defenses, especially if he appears in groups. The Barrier prevents General GreGory from being knocked back by the initial hit if the attacker doesn't have a Barrier Breaker (such as Fencer Cat). Still, his barrier is quite weak meaning most attackers can deal with it easily. After its barrier breaks, you can use Crowd Controllers such as Seaferer Cat to subdue him, greatly reducing his pushing power.