The Science Channel in the U.S. lists the seasons (and some episodes) of this show differently from the Canadian version:
Season 1+2 (Canada): Season 1
Season 3+4 (Canada): Season 2
Season 5+6 (Canada): Season 3
Season 7+8 (Canada): Season 4
Season 9+10 (Canada): Season 5
Season 11+12 (Canada): Season 6
Season 13+14 (Canada): Season 7
Season 15-27 (Canada): Season 8-20
Season 28 (episode 1-10) (Canada): Season 21
Season 28 (episode 11-13) + 29 + 30 (episode 1+2) (Canada): Season 22
Season 31 + 32 + 30 (episode 3-4) (Canada): Season 23
Season 30 (episode 5-13) (Canada): Season 24
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The show has different narrators for different regions.
In Canada, the show's origin, there are four narrators: Mark Tewksbury in Season 1, Lynn Herzeg in Season 2 to 4, June Wallack in Season 5, and Lynne Adams in Season 6 and onwards.
In the U.S., its narrator is Brooks T. Moore. Zac Fine replaces him in Season 9 and 10.
