 
<translate> Iji zaa ajụjụ a dị n'elu, ahịrịokwu dị mkpa bụ: Rob Reiner rụrụ ọrụ nke Michael Stivic n'oge usoro. Ya mere, azịza ya bụ Rob Reiner. <eng> To answer the above question, the relevant sentence is: Rob Reiner played the role of Michael Stivic throughout the series.
Therefore, the answer is Rob Reiner. 