<Li> Bree Turner as Rosalee Calvert (recurring season 1; regular seasons 2 to 6), a foxlike creature called a Fuchsbau who takes over her brother's Wesen spice shop after he is murdered . Rosalee assists Nick and Monroe in their efforts by providing more information and remedies to supernatural problems, such as helping extract a golden "egg" from a birdlike Wesen and developing a cure for Nick's Wesen - induced blindness . She marries Monroe in the season 3 finale and reveals she is pregnant in the season 5 finale . </Li> <Li> Claire Coffee as Adalind Schade (recurring seasons 1 & 2 (part); regular seasons 2 (part) to 6), a witchlike Wesen called a Hexenbiest who is working for Renard and who after ingesting Nick's blood becomes a normal human being . Seeking revenge, she poisons Juliette to forget all memories of Nick and starts colluding with Renard's half - brother Eric, eventually regaining her powers through agonizing rituals . She has a daughter with Sean, Diana Schade - Renard, who has unique powers . Later on, she gives birth by emergency C - section to her second child, a boy she names Kelly (after Kelly Burkhardt), whose father is revealed to be Nick, as she slept with him during a complex ritual to take his powers that involved her disguising herself as Juliette . After Juliette is transformed into Eve, Adalind moves in with Nick to care for Kelly, the two even forming a relationship, but this is complicated by Black Claw's attempts to use Diana to improve Renard's image in his mayoral campaign . </Li> <P> Many of the episodes are loosely based on stories published by the Brothers Grimm, albeit with considerable artistic license taken . For example, the pilot centered around a wolf - man who preyed on women who wore red . Other episodes are based on different sources, including fables and legends, not published by the Brothers Grimm . </P> <Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> <Th_colspan="2"> Nielsen ratings </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> <Th> Rank </Th> <Th> Average viewership (in millions) </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> October 28, 2011 (2011 - 10 - 28) </Td> <Td> May 18, 2012 (2012 - 05 - 18) </Td> <Td> 89 </Td> <Td> 6.36 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> August 13, 2012 (2012 - 08 - 13) </Td> <Td> May 21, 2013 (2013 - 05 - 21) </Td> <Td> 60 </Td> <Td> 7.06 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> October 25, 2013 (2013 - 10 - 25) </Td> <Td> May 16, 2014 (2014 - 05 - 16) </Td> <Td> 52 </Td> <Td> 7.97 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> October 24, 2014 (2014 - 10 - 24) </Td> <Td> May 15, 2015 (2015 - 05 - 15) </Td> <Td> 65 </Td> <Td> 6.98 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 5 </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> October 30, 2015 (2015 - 10 - 30) </Td> <Td> May 20, 2016 (2016 - 05 - 20) </Td> <Td> 76 </Td> <Td> 5.97 </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 6 </Td> <Td_colspan="2"> 13 </Td> <Td_colspan="1"> January 6, 2017 (2017 - 01 - 06) </Td> <Td> March 31, 2017 (2017 - 03 - 31) </Td> <Td> 70 </Td> <Td> 6.07 </Td> </Tr> </Table>

What is the tv series grimm based on
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