Hildegard Johnson

Hildegard Johnson (voiced by Vicki Lawrence) is a recurring character of the 2007 animated series Phineas and Ferb, and also one of the three secondary villains of the 2009 Japanese horror anime film Alvin and the Chipmunks: The Assassin Within. She is the paternal grandmother of Suzy Johnson (Kari Wahlgren) and Jeremy Johnson (Mitchell Musso), the mother of Mr. Johnson, and also the mother-in-law of Mrs. Johnson (Jane Lynch).

History
Little is known of Hildegard Johnson before her first encounters with Donald Walls, but it is known that she was a leader of a group of female bikers, and two of her members were Gladys Sharp (Allison Janney) and Cruella De Vil (April Winchell).

In 2003, Hildegard, along with Gladys Sharp and Cruella De Vil stop at a small convenience store in Monterrey Park. Both Hildegard and Gladys held Brittany (Christina Applegate) and Jeanette (Anna Faris) hostage while Cruella was making trouble for Eleanor (Amy Poehler). When she has Brittany's thrown pink wallet, she wants Eleanor to ask her politely for the pink wallet back with a word "Ella", so Eleanor does. Both Hildegard and Gladys let Brittany and Jeanette go. While she, Eleanor, and Brittany get ready to leave, Hildegard was outside, drinking a can of guava juice as she sees Brittany, Jeanette, and Eleanor inside the car. When Brittany starts the car, Hildegard begins smashing the car windshield that Brittany was driving. However, Brittany runs over their motorcycles, causing Hildegard to fume and shout in anger while Jeanette and Eleanor praises Brittany as they drive away.

The three women stops at the suburbs of Riverside. Hildegard goes to a haunted house across from Stacy Hirano's house and discovers Gladys dead. When she sees Donald Walls (posing as Theodore Seville), she grabs a meat cleaver, hoping to defend herself from the vengeful assassin. Theodore/Donald continues his scope out of the haunted house, only to have Hildegard appear and start attacking him with a meat cleaver. Theodore/Donald counterattacks by hitting Hildegard with a Chinese umbrella. While Theodore/Donald is trying to kill Ashley Grey (Bella Thorne), she runs into the haunted house. She is suddenly met by Hildegard, who survived the earlier fight with Theodore/Donald. Enraged, Theodore/Donald turns his attention to Hildegard by using a meat cleaver to chops off her left hand. Ashley Grey continues running in fear as Hildegard screams in horror after Theodore/Donald chops off her left hand and hacked her to death with a meat cleaver. Hildegard's one-handed corpse was later found and eventually taken away by the paramedics.