Grundel was the main antagonist of Thumbelina.
He is the eldest of Mrs. Toad's sons who intends to marry Thumbelina (much to the latter's dismay). He was voiced by the late Joe Lynch in his final film after his retirement that same year and his death in 2001.
Role in Film
Grundel plots to capture and marry Thumbelina and defeat his three other competitiors for her: Berkeley Beetle (whom he pulls the wings off of to make sure he helped find her), Mr. Mole, and Prince Cornelius.
In the climax, Grundel fights Cornelius with a torch. Grundel knocks him out and disarms him, but Cornelius grabs his leg and they both fall through the bottomless pit in Mr. Mole's tunnel.
In the credits, he is seen in the book and married to the female toad.