That '70s Show is a sitcom.
Kevin McDonald . He is known as a member of The Kids in the Hall , the voice of Pleakley in the Lilo & Stitch franchise , Waffle in Catscratch , Pastor Dave in That 70s Show , and the Almighty Tallest Purple in Invader Zim . That '70s Show is an American television period sitcom that originally aired on Fox from August 23 , 1998 , to May 18 , 2006 .