In Veronica Mars, Gallner played the role of a young teenage boy, Cassidy ``Beaver'' Casablancas, the younger brother of Dick Casablancas. Very smart, he is often bullied by his brother. After playing Bart Allen in the Smallville episode ``Run'', Gallner reprised his role on the January 18, 2007 episode ``Justice'' and the season 8 finale.
Bart Allen
Gallner