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The 'Sherlock' star lends his voice for the series' penultimate episode.
The actor joins returning guest star Catherine Tate in the March 8 episode, airing 7 p.m. ET/PT on Disney XD and DisneyNOW.
They guest star on a special Darkwing Duck episode of the animated series.
Disney XD's animated series welcomes the classic character on Saturday's episode.
It's all about the '90s! 'DuckTales' airs Saturday, April 4 at 10 a.m. ET/PT on DisneyXD and in DisneyNOW.
Watch the new trailer featuring Lin-Manuel Miranda, Julie Bowen, Jaime Camil and Catherine Tate.
