Organizers behind the Edmonton Comic and Entertainment Expo announced three big names set to headline the event this year.

This year, Simon Helberg and Kunal Nayyar – also known as Howard Wolowitz and Raj Koothrappali on CTV’s Big Bang Theory will be part of the guest line-up.

The pair joins previously announced guest J. August Richards, from Marvels Agents of S.H.I.E.L.D.

Last month, CTV announced The Big Bang Theory had topped their list of most-watched TV shows for the fourth year in the row, with an average of 3.5 million viewers.

At the same time, CTV said Marvels Agents of S.H.I.E.L.D. was the top new series of the year in Canada, with an average audience of 2 million viewers.

The Edmonton Expo is scheduled for September 26 to 28 at the Edmonton EXPO Centre.