Who plays voice on Phineas and Ferb when candace goes to the future?

While the character of Candace is voiced by Ashley Tisdale throughout the series, the future Candace in the episode "Phineas and Ferb's Quantum Boogaloo" is voiced by Alyson Stoner.

Alyson Stoner is also known for voicing the character of Isabella Garcia-Shapiro in the series.