The duo will share the screen in the sitcom finale that airs May 16.

Thanks to the power of technology,Young Sheldonand Old Sheldon can coexist.

His finger briefly blocks the camera, then moves to reveal Parsons sporting a similar outfit.

Iain Armitage in YOUNG SHELDON, and Jim Parsons in THE BIG BANG THEORY

Iain Armitage and Jim Parsons in ‘Young Sheldon’ and ‘The Big Bang Theory’.Sonja Flemming/CBS via Getty (2)

“Hmmm Im not sure about this.

Oh, it changes your voice too,” jokes Parsons-as-Armitage.

“I dont like it.”

The gag comes a week afterYoung Sheldonwrapped production on itsseventh and final season.

Ofreprising their roles together, Parsons toldTodaythat the experience was very weird but beautiful.

He explained, It was really sweet.

Young Sheldonairs Thursdays at 8 p.m. ET/PT on CBS, with the finale slated to air May 16.