Mister Hefty is an invisible hippopotamus. However, he is really just a figment of the imagination of a boy from New Tek City. The child's mother sarcastically asked if he was still being followed by Mister Hefty after the child saw Sonic the Hedgehog run down the side of his apartment building. If he was indeed real, he perished with the rest of the Special Zone.
Appearances[]
- Issue 87 - Mister Shifter (mentioned)