United Kingdom, June 13 -- Bryan Cranston has revealed Erik Per Sullivan won't be joining the Malcolm in the Middle reboot because he studying for a master's degree at Harvard.

The Breaking Bad star played frazzled dad Hal in the 2000s show with Christopher Masterson, Justin Berfield, Frankie Muniz and Erik playing his four sons and they are all returning for a revival of the series with the exception of Erik - who played youngest boy Dewey. Now Bryan has revealed the former child star, who is now 33, won't be returning because he's busy with his studies and hasn't acted since he was a child.

During an appearance on the 'Fly on the Wall' podcast, Bryan explained: "I talked to Erik and I said: 'Hey, we got the show! It's gonna come back....