Michael Bell
Michael Bell provides the voices of Drew, Chas and Boris. He also provided the voices of numerous other characters, including Spike (in Chuckie's dream in "In the Dreamtime"), as well as Ace, the mechanic in the episode "Graham Canyon". Additionally, he filled in for Phil Proctor as the voice of Howard in "Touchdown Tommy" (most likely because Howard does not have any individual lines in this particular episode; any time he speaks it's alongside one of the other guys).
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Interview with Michael Bell the voice of Chucky's dad on RUGRATS