Mungojerrie and Rumpleteazer are fictional characters in T. S. Eliot's book 'Old Possum's Book of Practical Cats' which was adapted into the musical 'Cats'.

Mungojerrie and his partner in crime, Rumpleteazer, specialize in petty theft and mischief. In Eliot's original poem "Mungojerrie and Rumpelteazer", they are depicted knocking over Ming vases and stealing items from their human family. Mungojerrie is also mentioned in the poem "Macavity, the Mystery Cat", where he is rumoured to be one of Macavity's agents. They live at Victoria Grove in Kensington, England.

In Eliot's original poem, Rumpelteazer is suggested to be a male cat: "...they were plausible fellows..." However, Rumpleteazer is usually portrayed as female in the musical.

In the original Broadway production, the person cast as Rumpleteazer doubled as another character, Etcetera. In smaller local productions, this double character casting still occurs. In addition, Rumpleteazer and Mungojerrie can be cast to double as another tertiary set of characters: the twins Tantomile and Coricopat.

More Info: en.wikipedia.org