After being lost in space for more than two decades, Rocko and his pals — and, you know, the Bigheads — are returning to Earth. And they’re all in for a rude awakening.

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Nickelodeon on Thursday officially announced that a one-hour TV special, Rocko’s Modern Life: Static Cling, will reunite the animated series’ original voice cast as the characters adjust to life in the 21st century.

And some will adjust more successfully than others. Per the network, “Heffer and Filburt embrace every aspect of new technology, social...