Flappy appears when Tom uses Jerry as bait for fishing. Jerry runs, causing Flappy to give chase, eating Tom's fishing pole in the process. He proceeds to slap Tom with his tail, then smack the reel at his face before returning to the water.
Tom casts Jerry again, and Flappy awaits him with a plate and utensils. He tries to impale and eat Jerry again, but Jerry escapes and squirts him in the eye with a lemon. Flappy gives chase again, and Tom smacks the water in an attempt to get him. He hits Jerry instead, who knocks him into the water and ties a lure to his tail, causing Flappy to bite it and begin pulling Tom. Tom resists, and ends up flinging Flappy at a sleeping Spike. Flappy his Spike and slaps him before retreating back into the water for good.
Flappy appears a large, turquoise and green Pike with large white eyes and hand-like front fins. He also has massive, sharp teeth lining his large mouth.
Flappy is a wrathful, hot-tempered fish with an enormous appetite. He openly antagonizes anyone he comes across, usually through physical harm or attempt at physical harm. He is vicious and cruel, not caring about anyone or the consequences of his actions.
- Flappy's name is unofficial, but accepted by most fans.
- In the Tom and Jerry Tales episode "Over the River and Boo the Woods", he reappears, redesigned as dark grey with red fur with black devil horns. However, there is some debate over whether or not this is Flappy or another evil fish.
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