He is a small dog and a member of the Justice. The organization consists of only dogs and it helps humans in need.
Alexander goes along with the organization when the member, Jodie's owners are in danger as they have been kidnapped and taken hostage by two dangerous fugitives. Because he is a smallest dog of the pack, he is mostly seen riding on Hulk's back. However, his size was proven useful when he tricks the Fugitives into thinking that he broke down the door with a log by himself (the other dogs waiting outside the house actually did that) and as he switched off the lights, Alexander bites one of the fugitive's testicles in the dark. After the rescue, he is seen sitting on the couch at home watching TV and is greatly offended when his group were not mentioned on the news.
- Some fans believe he's an Cairn Terrier, but nothing is confirmed