User blog comment:IMCR8Z/Plants vs. Zombies 2 World Idea: Garden of Darkness/@comment-25472986-20141224172942

Zombot almanac entry:

This guy is the beta Zombot. He never had a portal installed into the mouth,but Zomboss made him summon zombies strangely. We don't know how. However,we do know that he loves eating brains through his mechanical monstrous mouth.