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Hildegard Johnson (Vicki Lawrence) is the grandmother of Jeremy Johnson and Suzy Johnson. She is also a long-standing rival of Betty Jo Flynn from when they were both in the Roller Derby.
After a re-match in Phineas and Ferb's roller rink that they specially built for the ocassion, and the race ends in a tie - yet they still disagree about who won and race of towards the Rutherford Hayes statue, just as the Bread-Ray fires. The roller rink is turned into a giant loaf of bread, then by the hungry magpies, just before Mum has a chance to see either. It is shown that she is a cheater and hates losing. ("Crack That Whip")
