Paul Rudd will star in the season finale of Moone Boy on Sky One next Monday.
The star of Anchorman, Knocked Up and the forthcoming Ant-Man was first announced to star alongside Chris O’Dowd last year.
In the episode, Martin and Sean discover that Grandad also has an imaginary friend.
No foolin' folks, here's me, @nickvmurphy and himself on the #MooneBoy set, naked from the waist down. #PaulRudd. pic.twitter.com/xEXxbmHLM9
— chris o'dowd (@BigBoyler) April 1, 2015
Other cameos in this series have included Terry Wogan and comedian Sharon Horgan.
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