Janet Waldo, one of the best-known female TV voice-overs ever, is another H&B regular. She's also known as Judie Jetson, Penelope Pitstop, Morticia Addams, Josie (from Josie and the Pussycats), and even Lana Lang from the sixties "Superman" cartoon series.

She started in the business in 1938, doing straight acting as well as all those voice-overs, and can boast a long and fruitful career.
Janet Waldo would play Alice again, twenty one years later, in a cartoon version of "Through The Looking Glass".

Also in "Alice" were Daws Butler and Don Messick, the voices of many other Hanna and Barbera cartoon characters. Daws Butler played the King of Hearts and the March Hare, and Don Messick played the Dormouse and Alice's dog, Fluff).

There were two Mad Hatters of opposite gender, played by gossip columnist Hedda Hopper as Hedda Hatter, and Mel Brooks regular, Harvey Korman, as the Hatter. (Also to appear in Irwin Allen's 1985 'Alice' as the White King.)
Other voices included Zsa Zsa Gabor as the Queen of Hearts, Howard Morris as the White Rabbit, Allan Melvin as both Alice's Father and Humphrey Dumpty (Humphrey?)

The Hanna Barbera team were the creative force behind many, many classic cartoon series, including argueably the most famous of all of them - the Flintstones. Mel Blanc and Alan Reed recreated their Barney Rubble and Fred Flintstone characters in the 'Alice' special, playing the two-headed Caterpillar.
(Two hea . . . ??? No, never mind.)