“Happy Endings” star Casey Wilson sat in for Rita Ora on Grand Ole Opry Night.

Fittingly, he sang “Take Me Home, Country Roads,” byJohn Denver.

Before it was time to unmask Griffin, we got the return of Lucky Duck.

Nick Cannon and Griffin on ‘The Masked Singer’

Nick Cannon and Griffin on ‘The Masked Singer’.Credit:Michael Becker

Here’s a clue about my famous identity: We were in a historic TV series together."

The panel thought it could refer toSNL, while Wilson noted she’d also been onDrunk History.

On to the unmasking!

Robin Thicke, Jenny McCarthy-Wahlberg, guest panelist Casey Wilson, and Ken Jeong on ‘The Masked Singer’

Robin Thicke, Jenny McCarthy-Wahlberg, guest panelist Casey Wilson, and Ken Jeong on ‘The Masked Singer’.Michael Becker

Vivien Killilea/Getty

Here’s hoping Wilson brings her expertise back soon!

The Masked Singerairs Wednesdays at 8 p.m. ET/PT on Fox.

James Van Der

James Van Der Beek.Vivien Killilea/Getty