Two new spots form part of a £2.5 million programme to boost the brand's profile.
The ads, called "park" and "living room", introduce a wizard-like character, seeking out things he considers "wrong".
In "park" he pounces on a mother and snatches one of her square crisps, saying: "These are wrong. Look at their shape, they have not the rounded sides of the human snack. They be square."
In "living room" he bursts in on a boy eating Squares. He drags him outside and tips the crisps into the birdbath, proclaiming them "wrong" because they don't float.
The endline reads: "Walkers Squares? Tis not normal."
The ads break this week and run throughout April. They were written by Andy McAnaney, art directed by Christian Sewell and directed by Steven Reeves through Another Film Company.
Media planning and buying is through OMD UK.
Separately, AMV is unveiling an animated TV spot for Walkers' new Wotsits "Flamin Hot" flavour. The 30-second ad introduces Professor Watts and his meddlesome dog called Sid.
The professor makes Wotsits with his intricate production line. When Sid interferes it leads to the creation of some explosively hot crisps, which are accidentally bagged-up as "Flamin Hot" Wotsits.
The ad was written by Diane Leaver, art directed by Simon Rice and directed by Geoffrey de Crecy through Partizan. Media planning and buying is also through OMD.