Simon Pegg and Nick Frost roles from Shaun Of The Dead, Shaun and Ed have been brought back for the next Phineas And Ferb Halloween Special!
If you are not familiar with the ever popular Phineas and Ferb you have been missing out. The cartoon if filled with amazingly awesome g3k references,
Star Wars, Star Trek, The Wizard of Oz, Frankenstein, My Fair Lady, The Little Mermaid, E.T., Monty Python and the Holy Grail and The Rocky Horror Picture Show
there is a wiki devoted to them you can view here.