BrainPop: Season 4 - 31 Episode s
4x1 - Episode 1
June 16, 2000
4x2 - Episode 2
4x3 - Episode 3
4x4 - Episode 4
4x5 - Episode 5
4x6 - Episode 6
4x7 - Episode 7
January 18, 2001
4x8 - Episode 8
January 19, 2001
4x9 - Episode 9
January 25, 2001
4x10 - Episode 10
January 26, 2001
4x11 - Episode 11
February 1, 2001
4x12 - Episode 12
February 2, 2001
4x13 - Episode 13
February 8, 2001
4x14 - Episode 14
February 9, 2001
4x15 - Episode 15
February 15, 2001
4x16 - Episode 16
February 16, 2001
4x17 - Episode 17
February 22, 2001
4x18 - Episode 18
February 23, 2001
4x19 - Episode 19
March 1, 2001
4x20 - Episode 20
March 2, 2001
4x21 - Episode 21
March 8, 2001
4x22 - Episode 22
March 9, 2001
4x23 - Episode 23
March 15, 2001
4x24 - Episode 24
March 16, 2001
4x25 - Episode 25
March 19, 2015
4x26 - Episode 26
March 20, 2015
4x27 - Episode 27
March 26, 2015
4x28 - Episode 28
March 27, 2015
4x29 - Episode 29
April 2, 2015
4x30 - Episode 30
April 3, 2015
4x31 - Episode 31
April 9, 2015