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Picture 12 / 13

Picture 12 / 13

'The Graduation Transmission' - Season 8, Episode 22

Leonard is set to give the commencement address at his former high school, but a canceled flight threatens to prevent him from giving the speech. Meanwhile, Howard's engineering skills are tested as he and Sheldon attempt to fix Raj's toy helicopter, while Raj plays his parents against each other after his father cuts him off financially.

Air Date: April 23, 2015.

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