Clyde made his first appearance in "His Hare Raising Tale". Clyde visits Bugs, who narrates about playing baseball ("Baseball Bugs"), going to the moon ("Haredevil Hare"), and being in the military. However, Clyde doesn't believe Bugs. His second appearance was in "Yankee Doodle Bugs", where he has difficulty trying to remember information for a test. Bugs narrates about history, but he places himself in all of the events. Of course, when Clyde returns from school after taking the test, he has failed (as evidenced by a dunce cap). Clyde also appeared for the third time in the 1979 Christmas-themed short Bugs Bunny's Looney Christmas Tales (voiced by June Foray). In recent years, he was voiced by Joe Alaskey, briefly by Bob Bergen and later by Jess Harnell (1998-present).
His Hare Raising Tale
Bugs Bunny: All American Hero/Yankee Doodle Bugs
Bugs Bunny's Looney Christmas Tales
New Looney Tunes