1) Assigned an unsuitable role 2) Cast 3) Given an unsuitable role 4) Having the wrong part 5) Hire Mutt to play Jeff 6) In the wrong role 7) Like Don Knotts as Rambo 8) Like Lou Costello as Hamlet 9) Like Sinatra playing Caruso 10) Not right for the part 11) Not suited for the part 12) Put in the wrong role 1) Unsuited 
• (n.) An erroneous cast or reckoning. • (v. t.) To cast or reckon wrongly.
Mis·cast' noun An erroneous cast or reckoning. Mis·cast' transitive verb To cast or reckon wrongly. 
[v] - cast an actor, singer, or dancer in an unsuitable role