Film
* Poltergeist (1982) - as The Reverend
* The Running Man (1987) - as Captain Freedom
* The Rocketeer (1991) - as "Big" Ed
* The Last Boy Scout (1991) - as Big Al
* The Santa Clause (1994) - as The Elf
* Major League II (1994) - as The Umpire
* The Santa Clause 2 (2002) - as The Elf
* The Santa Clause 3: The Escape Clause (2006) - as The Elf
Television
* The Dukes of Hazzard (1979-1985) - as Deputy Cletus Hogg
* Baywatch (1989-2001) - as Deputy Cletus Hogg
* Walker, Texas Ranger (1993-2001) - as Deputy Cletus Hogg
* Walker, Texas Ranger: Trial by Fire (2005) - as Deputy Cletus Hogg
* The O.C. (2003-2007) - as Deputy Cletus Hogg
* The King of Queens (1998-2007) - as Deputy Cletus Hogg
* Without a Trace (2002-2009) - as Deputy Cletus Hogg
Other
* The Dukes of Hazzard: Reunion! (1997) - as Deputy Cletus Hogg
Blocker is best known for his role as Deputy Cletus Hogg in "The Dukes of Hazzard" and its various spin-offs and appearances in other television series. His distinctive voice and large stature made him a memorable character and contributed to his recognizable presence in numerous productions.