Season 4

01 Episode 1 Episode 13rd March 1973 02 Episode 2 Episode 210th March 1973 03 Episode 3 Episode 317th March 1973 04 Episode 4 Episode 424th March 1973 05 Episode 5 Episode 531st March 1973 06 Episode 6 Episode 67th April 1973 07 Episode 7 Episode 714th April 1973 08 Episode 8 Episode 821st April 1973 09 Episode 9 Episode 928th April 1973 10 Episode 10 Episode 105th May 1973 11 Episode 11 Episode 1112th May 1973 12 Episode 12 Episode 1219th May 1973 13 Episode 13 Episode 1326th May 1973 14 Episode 14 Episode 142nd June 1973 15 Episode 15 Episode 159th June 1973 16 Episode 16 Episode 1616th June 1973 17 Episode 17 Episode 1723rd June 1973 18 Episode 18 Episode 1830th June 1973 19 Episode 19 Episode 197th July 1973 20 Episode 20 Episode 2014th July 1973 21 Episode 21 Episode 2121st July 1973 22 Episode 22 Episode 2228th July 1973 23 Episode 23 Episode 234th August 1973 24 Episode 24 Episode 2411th August 1973 25 Episode 25 Episode 2518th August 1973 26 Episode 26 Episode 2625th August 1973 27 Episode 27 Episode 271st September 1973 28 Episode 28 Episode 288th September 1973 29 Episode 29 Episode 2915th September 1973 30 Episode 30 Episode 3022nd September 1973 31 Episode 31 Episode 3129th September 1973 32 Episode 32 Episode 326th October 1973 33 Episode 33 Episode 3313th October 1973 34 Episode 34 Episode 3420th October 1973