Mer-Zombie

The Mer-Zombie is one of the deadliest zombies in Plants vs. Zombies: The Final Showdown, as it moves as fast as a Dolphin Rider and when it reaches plants, it will dive under them, like a Pogo Zombie jumping. However, it is more than just an aquatic Pogo Stick Zombie, as Tall-nuts are unable to block it, and it's immune to Magnet-shrooms, leaving it with no true weaknesses.

Stats
Most of this is covered in the infobox.

Health: 17nds.

Speed: Rapid.

Attack Strength: N/A, never attacks any plant.

Special: Dives under any plant, completely ignoring all of your defenses.

Introduced in: Misty Pond Night 11.

Strategies
As it lacks weaknesses and can't be stalled, it is often best to use Plant Food or instant-kills to deal with early ones. Volt-shrooms are also very effective at taking out groups of Mer-Zombies. Later on, you have to build up a lot of offensive plants to deal with it, such as Snow Peas and Repeaters, or even Winter Melons, Melon-pults and Coconut Cannons.