Claim: Rob McElhenney has yet to appear on television.
Evidence: He is best known for playing Mac on the FX/FXX comedy series It 's Always Sunny in Philadelphia.
FX -LRB- originally an initialism of `` Fox Extended '' , pronounced and suggesting `` effects '' -RRB- is an American basic cable and satellite television channel launched on June 1 , 1994 , based in Los Angeles , California and owned by 21st Century Fox through FX Networks , LLC.