( CNN ) -- Joss Whedon has picked one formidable villain for The Avengers team to battle in the sequel to last year 's mega-grossing blockbuster . But sentient super-bot Ultron also presents a challenge for the film 's screenwriter too : How to make a machine that can do just about anything into an interesting on-screen character . Joss Whedon on his past , present , and future ( hint : 'Agents of SHIELD ' ) Created by a scientist in the Marvel comics , Ultron is a self-aware robot who develops a lust for power . He has a laundry list of abilities â€ ” super-human strength , speed , stamina , durability , flight , mind control , a coma ray and a genius intellect . For `` Avengers : Age of Ultron , '' Whedon reveals to Entertainment Weekly in this week 's cover story that he 's stripping back some of Ultron 's abilities and will find a way to humanize â€ ” to some degree â€ ” the angry bot . `` I knew right away what I wanted to do with him , '' Whedon says . `` He 's always trying to destroy the Avengers , goddamn it , he 's got a bee in his bonnet . He 's not a happy guy , which means he 's an interesting guy . He 's got pain . And the way that manifests is not going to be standard robot stuff . So we 'll take away some of those powers because at some point everybody becomes magic , and I already have someone [ a new character , Scarlet Witch ] who 's a witch . '' Whedon adds that he has to be careful `` to ground [ the character ] while still evoking that guy . '' And like a certain giant green Avenger hero , it sounds like large doses of rage will be key to his personality . `` As a character I love [ Ultron ] , '' Whedon says , `` because he 's so pissed off . '' For more , much more , from Whedon , pick up this week 's issue of Entertainment Weekly , on stands Friday , Aug. 23 , which features a 10-page Q & A spread with the writer-producer-director discussing his entire career and future projects . See the original story at EW.com . CLICK HERE to Try 2 RISK FREE issues of Entertainment Weekly . © 2011 Entertainment Weekly and Time Inc. All rights reserved .
Joss Whedon gives details about ' Avengers ' story . ' Age of Ultron ' centers around a sentient super - robot . Whedon says it is key part of robot 's personality .