![And welcome to a special retrospective,
And welcome to a special retrospective,](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
And welcome to a special RETROSPECTIVE,
The Big Bang Theory Season 10, Episode 21
![Based on the glowing reception of our
recent Behind the Flags Retrospective,
Based on the glowing reception of our
recent Behind the Flags Retrospective,](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Based on the glowing reception of our
recent Behind the Flags Retrospective,
The Big Bang Theory Season 10, Episode 21
![](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
"A Retrospective Retrospective."
The Big Bang Theory Season 10, Episode 21
![](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
"Fun with Flags, Behind the Flags,
A Retrospective."
The Big Bang Theory Season 10, Episode 21
![](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
"A Retrospective Retrospective."
The Big Bang Theory Season 10, Episode 21