Rogen provided the voice and motion capture for the title character , a grey alien , in the science fiction comedy '' Paul '' ( 2011 ) . The film also starred Simon Pegg and Nick Frost as a pair of geeks who help Paul escape from FBI agents . He reprised his voice role in '' Kung Fu Panda 2 '' , as well as produced and took a supporting role in Jonathan Levine 's '' 50/50 '' . The dramedy about cancer was based on an autobiographical script by screenwriter Will Reiser , and was released in September 2011 . The drama '' Take This Waltz '' , his fourth film of 2011 , featured Rogen as a man whose wife ( played by Michelle Williams ) explores a new relationship with another man . From 2011 to 2015 , Rogen played Dirty Randy , a librarian and pornographer , in the sitcom '' The League '' , in addition to writing two episodes . Rogen hosted the 27th Independent Spirit Awards in February 2012 and the road movie '' The Guilt Trip '' , also starring Barbra Streisand , was released in cinemas that December . The film was about an inventor ( Rogen ) who invites his mother ( Streisand ) on a road trip , as he attempts to sell his new product while also reuniting her with a lost love
27th Independent Spirit Awards
27th Independent Spirit Awards
Seth Rogen