When does Dexter's Laboratory return?

Dexter's Laboratory was created by Genndy Tartakovsky for Cartoon Network. The series follows Dexter, an enthusiastic boy-genius with a science laboratory in his bedroom. Dexter conceals his lab from his clueless parents, addressed only as Mom and Dad. Dexter is at constant odds with his older and more extraverted sister Dee Dee, who regularly accesses the laboratory and inadvertently foils his experiments. Dexter speaks with an accent of indeterminate origin.
Dexter (voiced by Christine Cavanaugh in seasons 1–3; Candi Milo in seasons 3–4) is a bespectacled boy-genius who, behind a bookcase in his bedroom, conceals a secret laboratory. Dexter conceals his lab from his clueless parents, addressed only as Mom and Dad, who never take notice of it. Dexter's nemesis is rival classmate Mandark Astronomonov[f], a boy genius with his own laboratory, but his schemes are generally evil and designed to gain power.