The actor will reprise his role as Howard Wolowitz in a flashback on the CBS comedy.

We’re about to hear again from Howard Wolowitz.

“But it’s always extra fun when we’re able to incorporateBig Bang TheoryEaster eggs into the storylines.

The Explosion Implosion

Sheldon Cooper (Jim Parsons) and Howard Wolowitz (Simon Helberg) on ‘The Big Bang Theory’.Monty Brinton/CBS

The episode will also feature the return ofReba McEntireas the ex-wife of Dale (Craig T. Nelson).

Watch the clip of Helberg reprising his role above.

The episode airs Nov. 18 at 8 p.m. ET/PT on CBS.

The Bow Tie Asymmetry

Simon Helberg on ‘The Big Bang Theory’.Michael Yarish/CBS