During filming, actor
Phil Silvers locked himself in his trailer and refused to come out. Director
Richard Lester asked
Jon Pertwee to step into the role of Lycus, as he already knew the part after performing it on stage. Once Silvers heard he had been replaced, he came out of his trailer, bursting with new enthusiasm for the project. Pertwee was given the (much) smaller role of Crassus as compensation.
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