Arrow - Episode 21 - Video Preview - The Undertaking

Here's the video preview of Arrow Episode 21: "The Undertaking" on The CW.

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Arrow 1x21 'The Undertaking' - Felicity finds a transaction on a crooked accountant's computer that could help Oliver locate Walter. Meanwhile, Malcolm reveals to Robert Queen and Frank Chen painful details about his wife's murder and how those things shaped his plans for the Glades. Original Air Date: May 1, 2013 on the CW.