<P> The series airs on Disney Channel in Canada . It premiered on Disney Channel in Australia and New Zealand on October 16, 2015 . </P> <P> Brian Lowry, writing for Variety, thought the series' pilot episode was formulaic and did not take full advantages of the time travel premise . In particular, the series "appears more content to focus on the humdrum details of Shelby and Cyd's frantic lives than, say, sending them back to meet Abraham Lincoln or ahead to a time of flying cars ." </P> <Table> <Tr> <Th> Season </Th> <Th> Episodes </Th> <Th_colspan="2"> First aired </Th> <Th_colspan="2"> Last aired </Th> <Th> Avg . viewers (millions) </Th> </Tr> <Tr> <Th> Date </Th> <Th> Viewers (millions) </Th> <Th> Date </Th> <Th> Viewers (millions) </Th> </Tr> <Tr> <Td> </Td> <Td> 18 </Td> <Td> June 26, 2015 (2015 - 06 - 26) </Td> <Td> 3.54 </Td> <Td> May 22, 2016 (2016 - 05 - 22) </Td> <Td> 1.23 </Td> <Td> 1.84 </Td> </Tr> <Tr> <Td> </Td> <Td> 12 </Td> <Td> July 25, 2016 (2016 - 07 - 25) </Td> <Td> 1.18 </Td> <Td> December 11, 2016 (2016 - 12 - 11) </Td> <Td> 0.94 </Td> <Td> 1.17 </Td> </Tr> </Table> <Tr> <Th> Season </Th> <Th> Episodes </Th> <Th_colspan="2"> First aired </Th> <Th_colspan="2"> Last aired </Th> <Th> Avg . viewers (millions) </Th> </Tr>

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