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Zach Callison, of Steven Universe and Mr. Peabody and Sherman, will be guest starring on NCIS: Los Angeles! The episode is set to air tomorrow, December 8th, beginning at 10 p.m. EST on CBS!

Zach will be in the season 6 episode called “Reign Fall”. He’ll be playing Devin Johnson, the son of a marine who is in a military academy. In this episode, Sam will look back on his relationship with his father and reflect on how he was brought up. His walk down memory lane will be triggered by the “NCIS LA” team’s investigation of a series of murders. It will involve marines that have sons in military academies.

Check out a couple stills from the episode and a preview of the episode below! Will you be watching?